1.
United States
–
Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
United States
–
Native Americans meeting with Europeans, 1764
United States
–
Flag
United States
–
The signing of the
Mayflower Compact, 1620.
United States
–
The
Declaration of Independence: the
Committee of Five presenting their draft to the
Second Continental Congress in 1776
2.
Geographic coordinate system
–
A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
Geographic coordinate system
–
Longitude lines are perpendicular and latitude lines are parallel to the equator.
3.
Mount Whitney
–
Mount Whitney is the highest summit in the contiguous United States and the Sierra Nevada, with an elevation of 14,505 feet. The west slope of the mountain is in Sequoia National Park, the east slope is in the Inyo National Forest in Inyo County. The summit of Whitney is on the Sierra Crest and the Great Basin Divide and it lies near many of the highest peaks of the Sierra Nevada. The peak rises dramatically above the Owens Valley, sitting 10,778 feet or just over two miles above the town of Lone Pine 15 miles to the east, in the Owens Valley. It rises more gradually on the west side, lying only about 3,000 feet above the John Muir Trail at Guitar Lake, the mountain is partially dome-shaped, with its famously jagged ridges extending to the sides. Mount Whitney is above the line and has an alpine climate. Very few plants grow near the summit, one example is the Skypilot, the only animals are transient, such as the butterfly Parnassius phoebus and the gray-crowned rosy finch. The mountain is the highest point on the Great Basin Divide, waterways on the west side of the peak flow into Whitney Creek, which flows into the Kern River. The Kern River terminates in the Tulare Basin, during very wet years, water overflows from the Tulare Basin into the San Joaquin River which flows to the Pacific Ocean. From the east, water from Mount Whitney flows to Lone Pine Creek, which joins the Owens River, which in turn terminates at Owens Lake, the estimated elevation of the summit of Mount Whitney has changed over the years. The technology of elevation measurement has become refined and, more importantly. The peak was commonly said to be at 14,494 ft, an older plaque on the summit reads elevation 14,496.811 feet but this was estimated using the older vertical datum from 1929. Since then the shape of the Earth has been estimated more accurately, using a new vertical datum established in 1988 the benchmark is now estimated to be at 14,505 ft. The rise is caused by a fault system that runs along the eastern base of the Sierra. Thus, the granite that forms Mount Whitney is the same as the granite that forms the Alabama Hills, the raising of Whitney is due to the same geological forces that cause the Basin and Range Province, the crust of much of the intermontane west is slowly being stretched. The granite that forms Mount Whitney is part of the Sierra Nevada batholith, in Cretaceous time, masses of molten rock that originated from subduction rose underneath what is now Whitney and solidified underground to form large expanses of granite. In July 1864, the members of the California Geological Survey named the peak after Josiah Whitney, during the same expedition, geologist Clarence King attempted to climb Whitney from its west side, but stopped just short. In 1871, King returned to climb what he believed to be Whitney, upon learning of his mistake in 1873, King finally completed his own first ascent of Whitney, but did so a month too late to claim the first recorded ascent
Mount Whitney
–
East Face close-up seen from the
Whitney Portal.
Mount Whitney
–
Sky pilot blooming on ridge just below summit.
Mount Whitney
–
Mount Whitney as seen from
Mount Langley
Mount Whitney
–
The Smithsonian Hut Shelter on Whitney's summit.
4.
Sierra Nevada (U.S.)
–
The Sierra Nevada is a mountain range in the Western United States, between the Central Valley of California and the Basin and Range Province. The vast majority of the lies in the state of California. The Sierra runs 400 miles north-to-south, and is approximately 70 miles across east-to-west, the Sierra is home to three national parks, twenty wilderness areas, and two national monuments. These areas include Yosemite, Sequoia, and Kings Canyon National Parks, the character of the range is shaped by its geology and ecology. More than one hundred years ago during the Nevadan orogeny. The range started to uplift four M. A. ago, the uplift caused a wide range of elevations and climates in the Sierra Nevada, which are reflected by the presence of five life zones. Uplift continues due to faulting caused by forces, creating spectacular fault block escarpments along the eastern edge of the southern Sierra. The Sierra Nevada has a significant history, the California Gold Rush occurred in the western foothills from 1848 through 1855. Due to inaccessibility, the range was not fully explored until 1912, the Sierra Nevada lies in Central and Eastern California, with a very small but historically important spur extending into Nevada. West-to-east, the Sierra Nevadas elevation increases gradually from 1,000 feet in the Central Valley to an height of about 10,500 feet at its crest only 50–75 miles to the east. The east slope forms the steep Sierra Escarpment, unlike its surroundings, the range receives a substantial amount of snowfall and precipitation due to orographic lift. The Sierra Nevada stretches from the Susan River and Fredonyer Pass in the north to Tehachapi Pass in the south and it is bounded on the west by Californias Central Valley and on the east by the Basin and Range Province. The geographical boundary between the Sierra and the Cascades is virtually indistinguishable, with the Fredonyer Pass designation being traditional, physiographically, the Sierra is a section of the Cascade-Sierra Mountains province, which in turn is part of the larger Pacific Mountain System physiographic division. The range is drained on its western slope by the Central Valley watershed, the northern third of the western Sierra is part of the Sacramento River watershed, and the middle third is drained by the San Joaquin River. The eastern slope watershed of the Sierra is much narrower, its rivers flow out into the endorheic Great Basin of eastern California and western Nevada. Although none of the eastern rivers reach the sea, many of the streams from Mono Lake southwards are diverted into the Los Angeles Aqueduct which provides water to Southern California, the height of the mountains in the Sierra Nevada increases gradually from north to south. Between Fredonyer Pass and Lake Tahoe, the range from 5,000 feet to more than 9,000 feet. The crest near Lake Tahoe is roughly 9,000 feet high, farther south, the highest peak in Yosemite National Park is Mount Lyell
Sierra Nevada (U.S.)
–
The Sierra's
Mills Creek cirque (center) is on the west side of the
Sierra Crest, south of
Mono Lake (top, blue).
Sierra Nevada (U.S.)
–
Mount Whitney, the highest peak in the range and the contiguous United States
Sierra Nevada (U.S.)
–
The Sierra hosts many waterways, such as the
Tuolumne River.
Sierra Nevada (U.S.)
–
Mount Tallac above
Lake Tahoe
5.
Badwater Basin
–
Badwater Basin is an endorheic basin in Death Valley National Park, Death Valley, Inyo County, California, noted as the lowest point in North America, with an elevation of 282 ft below sea level. Mount Whitney, the highest point in the contiguous 48 United States, is only 84.6 miles to the north west. The site itself consists of a small spring-fed pool of bad water next to the road in a sink, the pool does have animal and plant life, including pickleweed, aquatic insects, and the Badwater snail. Adjacent to the pool, where water is not always present at the surface, repeated freeze–thaw, the pool is not the lowest point of the basin, the lowest point is several miles to the west and varies in position, depending on rainfall and evaporation patterns. The salt flats are hazardous to traverse, and so the sign marking the low point is at the pool instead, the basin was considered the lowest elevation in the Western Hemisphere until the discovery of Laguna del Carbón in Argentina at −344 ft. At Badwater Basin, significant rainstorms flood the valley bottom periodically, newly formed lakes do not last long though, because the 1.9 in of average rainfall is overwhelmed by a 150 in annual evaporation rate. This is the greatest evaporation potential in the United States, meaning that a 12 ft lake could dry up in a single year, when the basin is flooded, some of the salt is dissolved, it is redeposited as clean crystals when the water evaporates. A popular site for tourists is the sign marking sea level on the cliff above the Badwater Basin, numerous evaporation cycles and a lack of outflow caused an increasing hypersalinity, typical for endorheic bodies of water. Over time, this hypersalinization, combined with sporadic rainfall and occasional aquifer intrusion, has resulted in periods of briny soup, or salty pools, on the lowest parts of Death Valleys floor. Salts began to crystallize, coating the surface with the thick crust, ranging from 3 to 60 in, Death Valley pupfish List of elevation extremes by country List of elevation extremes by region John McKinney, Californias Desert Parks, A Day Hikers Guide. Wilderness Press 2006, ISBN 0-89997-389-2, S. 54–55 Don J. Easterbrook, geological Society of America 2003, ISBN 94-592-0504-6, S. 63–64 Badwater Basin in the Encyclopædia Britannica
Badwater Basin
–
Badwater Basin
Badwater Basin
–
Badwater Basin elevation sign
Badwater Basin
–
View of the Basins's
salt flats
Badwater Basin
–
Crust of hexagonal shapes
6.
Death Valley
–
Death Valley is a desert valley located in Eastern California. It is one of the hottest places in the world at the height of summertime along with deserts in Africa, Death Valleys Badwater Basin is the point of the lowest elevation in North America, at 282 feet below sea level. This point is 84.6 miles east-southeast of Mount Whitney, Death Valleys Furnace Creek holds the record for the highest reliably recorded air temperature in the world,134 °F on July 10,1913. This has been contested by other weather experts and it is located mostly in Inyo County, California. It has an area of about 3,000 sq mi, the highest point in Death Valley itself is Telescope Peak in the Panamint Range, which has an elevation of 11,043 feet. Death Valley is one of the best geological examples of a basin and it lies at the southern end of a geological trough known as Walker Lane, which runs north into Oregon. The valley is bisected by a right lateral slip fault system, represented by the Death Valley Fault. The eastern end of the left lateral Garlock Fault intersects the Death Valley Fault, Furnace Creek and the Amargosa River flow through the valley but eventually disappear into the sands of the valley floor. Death Valley also contains salt pans, according to current geological consensus, at various times during the middle of the Pleistocene era, inland lakes formed in Death Valley. Lake Manly received water overflowing from a chain of other Pleistocene lakes, Death Valley has a subtropical, hot desert climate, with long, extremely hot summers and short, warm or mild winters, as well as little rainfall. As a general rule, lower altitudes tend to have higher temperatures, when the sun heats the ground, that heat is then radiated upward, but the dense below-sea-level air absorbs some of this radiation and radiates some of it back towards the ground. In addition, the valley walls trap rising hot air and recycle it back down to the valley floor. This process is important in Death Valley, as it provides its specific climate. The valley is surrounded by mountains, while its surface is flat and devoid of plants, so much of the suns heat can reach the ground, absorbed by soil. When air at ground level is heated, it begins to rise, moving up past steep, high mountain ranges, which then cools slightly, sinking back down towards the valley more compressed. This air is reheated by the sun to a higher temperature, moving up the mountain again, whereby the air moves up and down in a circular motion in cycles. This heated air increases ground temperature markedly, forming the hot wind currents that are trapped by atmospheric pressure and mountains, Death Valley holds temperature records because it has an unusually high number of factors that lead to high atmospheric temperatures. The depth and shape of Death Valley influence its summer temperatures, the valley is a long, narrow basin 282 feet below sea level, yet is walled by high, steep mountain ranges
Death Valley
–
Satellite photo of Death Valley
Death Valley
–
Death Valley Sand Dunes
Death Valley
–
View from
Badwater Basin
Death Valley
–
Death Valley in 2005 springtime bloom
7.
Geographic information system
–
A geographic information system is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data. What goes beyond a GIS is a spatial data infrastructure, a concept that has no such restrictive boundaries, in general, the term describes any information system that integrates, stores, edits, analyzes, shares, and displays geographic information. GIS applications are tools that allow users to create interactive queries, analyze spatial information, edit data in maps, Geographic information science is the science underlying geographic concepts, applications, and systems. GIS is a term that can refer to a number of different technologies, processes. It is attached to operations and has many applications related to engineering, planning, management, transport/logistics, insurance, telecommunications. For that reason, GIS and location intelligence applications can be the foundation for many location-enabled services that rely on analysis, GIS can relate unrelated information by using location as the key index variable. Locations or extents in the Earth space–time may be recorded as dates/times of occurrence, and x, y, and z coordinates representing, longitude, latitude, all Earth-based spatial–temporal location and extent references should be relatable to one another and ultimately to a real physical location or extent. This key characteristic of GIS has begun to open new avenues of scientific inquiry, the first known use of the term geographic information system was by Roger Tomlinson in the year 1968 in his paper A Geographic Information System for Regional Planning. Tomlinson is also acknowledged as the father of GIS, previously, one of the first applications of spatial analysis in epidemiology is the 1832 Rapport sur la marche et les effets du choléra dans Paris et le département de la Seine. The French geographer Charles Picquet represented the 48 districts of the city of Paris by halftone color gradient according to the number of deaths by cholera per 1,000 inhabitants and this was one of the earliest successful uses of a geographic methodology in epidemiology. The early 20th century saw the development of photozincography, which allowed maps to be split into layers, for one layer for vegetation. This work was drawn on glass plates but later plastic film was introduced, with the advantages of being lighter, using less storage space and being less brittle. When all the layers were finished, they were combined into one using a large process camera. Once color printing came in, the idea was also used for creating separate printing plates for each color. Computer hardware development spurred by nuclear weapon research led to general-purpose computer mapping applications by the early 1960s, the year 1960 saw the development of the worlds first true operational GIS in Ottawa, Ontario, Canada by the federal Department of Forestry and Rural Development. A rating classification factor was added to permit analysis. CGIS was an improvement over computer mapping applications as it provided capabilities for overlay, measurement and it supported a national coordinate system that spanned the continent, coded lines as arcs having a true embedded topology and it stored the attribute and locational information in separate files. As a result of this, Tomlinson has become known as the father of GIS, CGIS lasted into the 1990s and built a large digital land resource database in Canada
Geographic information system
–
E. W. Gilbert 's version (1958) of
John Snow 's 1855 map of the Soho cholera outbreak showing the clusters of cholera cases in the
London epidemic of 1854
Geographic information system
–
Example of hardware for mapping (
GPS and
laser rangefinder) and data collection (
rugged computer). The current trend for geographical information system (GIS) is that accurate mapping and data analysis are completed while in the field. Depicted hardware (field-map technology) is used mainly for
forest inventories, monitoring and mapping.
Geographic information system
–
An example of use of layers in a GIS application. In this example, the forest cover layer (light green) is at the bottom, with the topographic layer over it. Next up is the stream layer, then the boundary layer, then the road layer. The order is very important in order to properly display the final result. Note that the pond layer was located just below the stream layer, so that a stream line can be seen overlying one of the ponds.
Geographic information system
–
Hillshade model derived from a
Digital Elevation Model of the Valestra area in the northern Apennines (Italy)
8.
Basin and Range Province
–
The Basin and Range Province is a vast physiographic region that covers much of the inland Western United States and northwestern Mexico. It is defined by unique basin and range topography, characterized by changes in elevation. The physiography of the province is the result of tectonic extension that began around 17 Mya in Early Miocene time, the numerous ranges within the Province in the United States are collectively referred to as the Great Basin Ranges, although many are not actually in the Great Basin. Major ranges include the Snake Range, the Panamint Range, the White Mountains, the Sandia Mountains, pico de Orizaba is unambiguously part of the Trans-Mexican Volcanic Belt which has little in common with the Basin and Range Province. The highest point fully within the Province is White Mountain Peak in California, the Provinces climate is arid, with numerous ecoregions. Most North American deserts are located in the Province, the Basin and Range Province includes much of western North America. The Basin and Range Province extends north to the Columbia Plateau and south as far as the Trans-Mexican Volcanic Belt in Mexico, though the boundaries of the Basin. In Mexico, the Basin and Range Province is dominated by, common geographic features include numerous endorheic basins, ephemeral lakes, plateaus, and valleys alternating with mountains. The area is arid and sparsely populated, although there are several major metropolitan areas, including Mexico City. It is generally accepted that basin and range topography is the result of extension and thinning of the lithosphere, extensional environments like the Basin and Range are characterized by listric normal faulting, or faults that level out with depth. Opposing normal faults link at depth producing a horst and graben geometry, the average crustal thickness of the Basin and Range Province is approximately 30 –35 km and is comparable to extended continental crust around the world. The crust in conjunction with the mantle comprises the lithosphere. The base of the lithosphere beneath the Basin and Range is estimated to be about 60 –70 km, opinions vary regarding the total extension of the region, however, the median estimate is about 100% total lateral extension. Evidence exists to suggest that extension began in the southern Basin and Range. The tectonic mechanisms responsible for extension in the Basin and Range province are controversial. Most of the pertinent tectonic plate movement associated with the Basin and Range Province occurred in Neogene time, by Early Miocene time, much of the Farallon Plate had been consumed, and the seafloor spreading ridge that separated the Farallon Plate from the Pacific Plate approached North America. The movement at this boundary divided the East Pacific Rise and spawned the San Andreas transform fault, today, the Pacific Plate moves north-westward relative to North America, a configuration which has given rise to increased shearing along the continental margin. The tectonic activity responsible for the extension in the Basin and Range is a complex, the most accepted hypothesis suggests that crustal shearing associated with the San Andreas Fault caused spontaneous extensional faulting similar to that seen in the Great Basin
Basin and Range Province
–
NASA satellite photo of typical Basin and Range topography across central Nevada
Basin and Range Province
–
Snake Range
Basin and Range Province
–
Boundaries and landmarks of the Province, reflecting one of various geographical definitions of the Province
9.
Endorheic basin
–
Such a basin may also be referred to as a closed or terminal basin or as an internal drainage system. However, in a basin, rain that falls within it does not flow out but may only leave the drainage system by evaporation. The bottom of such a basin is occupied by a salt lake or salt pan. Endorheic regions, in contrast to regions which flow to the ocean in geologically defined patterns, are closed hydrologic systems. Their surface waters drain to inland terminal locations where the water evaporates or seeps into the ground, endorheic water bodies include some of the largest lakes in the world, such as the Aral Sea and the Caspian Sea, the worlds largest saline inland sea. Most endorheic basins are arid, although there are notable exceptions, such as the Valley of Mexico, the Lake Tahoe region. Endorheic basins can be massively and rapidly affected by change and excessive water removal. An exorheic lake naturally remains at a level, so water flow into the lake may be many times more than is needed to maintain its present size. In contrast, an endorheic basin does not have enough inflow that it overflows to the ocean, endorheic lakes are bodies of water that do not flow into the sea. Most of the water falling on Earth finds its way to the oceans through a network of rivers, lakes, however, there is a class of water bodies that are located in closed or endorheic watersheds where the topography prevents their drainage to the oceans. These endorheic watersheds are often called terminal lakes or sink lakes, endorheic lakes are usually in the interior of a landmass, far from an ocean in areas of relatively low rainfall. Their watersheds are often confined by natural geologic land formations such as a mountain range, the inland water flows into dry watersheds where the water evaporates, leaving a high concentration of minerals and other inflow erosion products. Over time this input of erosion products can cause the lake to become relatively saline. Endorheic regions can occur in any climate but are most commonly found in desert locations, the Black Sea was likely such a lake, having once been an independent hydrological system before the Mediterranean Sea broke through the terrain separating the two. Lake Bonneville was another such lake, overflowing its basin in the Bonneville flood, malheur/Harney Lake in Oregon is normally cut off from drainage to the ocean, but has an outflow channel to the Malheur River that is normally dry, but flows in years of peak precipitation. Examples of relatively humid regions in endorheic basins often exist at high elevation and these regions tend to be marshy and are subject to substantial flooding in wet years. The area containing Mexico City is one case, with annual precipitation of 850 mm. Endorheic regions tend to be far inland with their boundaries defined by mountains or other features that block their access to oceans
Endorheic basin
–
NASA photo of the endorheic
Tarim Basin
Endorheic basin
–
Endorheic basin showing waterflow input into
Üüreg Lake
Endorheic basin
–
The Okavango Delta (centre) of southern Africa, where the Okavango River spills out into the empty trough of the
Kalahari Desert. The area was a lake fed by the river during the Ice Ages.
Endorheic basin
–
Caspian Sea, a giant inland basin
10.
North America
–
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. It can also be considered a subcontinent of the Americas. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, and to the southeast by South America and the Caribbean Sea. North America covers an area of about 24,709,000 square kilometers, about 16. 5% of the land area. North America is the third largest continent by area, following Asia and Africa, and the fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 565 million people in 23 independent states, or about 7. 5% of the worlds population, North America was reached by its first human populations during the last glacial period, via crossing the Bering land bridge. The so-called Paleo-Indian period is taken to have lasted until about 10,000 years ago, the Classic stage spans roughly the 6th to 13th centuries. The Pre-Columbian era ended with the migrations and the arrival of European settlers during the Age of Discovery. Present-day cultural and ethnic patterns reflect different kind of interactions between European colonists, indigenous peoples, African slaves and their descendants, European influences are strongest in the northern parts of the continent while indigenous and African influences are relatively stronger in the south. Because of the history of colonialism, most North Americans speak English, Spanish or French, the Americas are usually accepted as having been named after the Italian explorer Amerigo Vespucci by the German cartographers Martin Waldseemüller and Matthias Ringmann. Vespucci, who explored South America between 1497 and 1502, was the first European to suggest that the Americas were not the East Indies, but a different landmass previously unknown by Europeans. In 1507, Waldseemüller produced a map, in which he placed the word America on the continent of South America. He explained the rationale for the name in the accompanying book Cosmographiae Introductio, for Waldseemüller, no one should object to the naming of the land after its discoverer. He used the Latinized version of Vespuccis name, but in its feminine form America, following the examples of Europa, Asia and Africa. Later, other mapmakers extended the name America to the continent, In 1538. Some argue that the convention is to use the surname for naming discoveries except in the case of royalty, a minutely explored belief that has been advanced is that America was named for a Spanish sailor bearing the ancient Visigothic name of Amairick. Another is that the name is rooted in a Native American language, the term North America maintains various definitions in accordance with location and context. In Canadian English, North America may be used to refer to the United States, alternatively, usage sometimes includes Greenland and Mexico, as well as offshore islands
North America
–
Map of North America, from 1621.
North America
–
North America
North America
–
The
El Castillo pyramid, at
Chichén Itzá, Mexico.
North America
–
Benjamin West 's
The Death of General Wolfe (1771) depicting the
Battle of the Plains of Abraham.
11.
Wyoming
–
Wyoming /waɪˈoʊmɪŋ/ is a state in the mountain region of the western United States. The state is the tenth largest by area, the least populous, Wyoming is bordered on the north by Montana, on the east by South Dakota and Nebraska, on the south by Colorado, on the southwest by Utah, and on the west by Idaho. Cheyenne is the capital and the most populous city in Wyoming, the state population was estimated at 586,107 in 2015, which is less than the population of 31 of the largest U. S. cities. The Crow, Arapaho, Lakota, and Shoshone were some of the inhabitants of the region. Southwestern Wyoming was included in the Spanish Empire and then Mexican territory until it was ceded to the United States in 1848 at the end of the Mexican–American War. The region acquired the name Wyoming when a bill was introduced to Congress in 1865 to provide a government for the territory of Wyoming. The territory was named after the Wyoming Valley in Pennsylvania, with the name ultimately being derived from the Munsee word xwé, wamənk, the mineral extraction industry—especially coal, oil, natural gas, and trona—along with the travel and tourism sector are the main drivers behind Wyomings economy. Agriculture has historically been an important component of the economy with the main commodities being livestock, hay, sugar beets, grain. The climate is generally semi-arid and continental, being drier and windier in comparison to the rest of the United States, except for the 1964 election, Wyoming has been a politically conservative state since the 1950s, with the Republican party winning every presidential election. Wyoming is one of three states to have borders along only straight latitudinal and longitudinal lines, rather than being defined by natural landmarks. Wyoming is bordered on the north by Montana, on the east by South Dakota and Nebraska, on the south by Colorado, on the southwest by Utah, and on the west by Idaho. It is the tenth largest state in the United States in total area, from the north border to the south border it is 276 miles, and from the east to the west border is 365 miles at its south end and 342 miles at the north end. The Great Plains meet the Rocky Mountains in Wyoming, the state is a great plateau broken by many mountain ranges. Surface elevations range from the summit of Gannett Peak in the Wind River Mountain Range, at 13,804 feet, to the Belle Fourche River valley in the states northeast corner, at 3,125 feet. In the northwest are the Absaroka, Owl Creek, Gros Ventre, Wind River, in the north central are the Big Horn Mountains, in the northeast, the Black Hills, and in the southern region the Laramie, Snowy and Sierra Madre ranges. The Snowy Range in the central part of the state is an extension of the Colorado Rockies in both geology and appearance. The Wind River Range in the west central part of the state is remote and includes more than 40 mountain peaks in excess of 13,000 ft tall in addition to Gannett Peak, the highest peak in the state. The Big Horn Mountains in the central portion are somewhat isolated from the bulk of the Rocky Mountains
Wyoming
–
Wind River Canyon
Wyoming
–
Flag
Wyoming
–
Thunder Basin National Grassland close to
Douglas, Wyoming
Wyoming
–
Seedskadee National Wildlife Refuge
12.
Idaho
–
Idaho is a state in the northwestern region of the United States. It borders the state of Montana to the east and northeast, Wyoming to the east, Nevada and Utah to the south, to the north, it shares a small portion of the Canadian border with the province of British Columbia. With a population of around 1.7 million people and an area of 83,569 square miles, Idaho is the 14th largest, the states capital and largest city is Boise. Idaho prior to European settlement was inhabited solely by Native American peoples, in the early 19th century, Idaho was considered part of the Oregon Country, an area disputed between the U. S. and the United Kingdom. Idaho was eventually admitted to the Union on July 3,1890, forming part of the Pacific Northwest, Idaho is divided into several distinct geographic and climatic regions. In the states north, the relatively isolated Idaho Panhandle is closely linked with Eastern Washington, the states south includes the Snake River Plain, while the south-east incorporates part of the Great Basin. Idaho is quite mountainous, and contains several stretches of the Rocky Mountains, additionally, around 38 percent of Idahos land is held by the United States Forest Service, the most of any state. Industries significant for the economy include manufacturing, agriculture, mining, forestry. Idahos agricultural sector supplies a number of different products, but the state is best known for its potato crop, the official state nickname is the Gem State, which references Idahos reputation for gemstones and, more broadly, its many wilderness areas. The exact origin of the remains a mystery. Willing later claimed that he had invented the name. Congress ultimately decided to name the area Colorado Territory when it was created in February 1861, thinking they would get a jump on the name, locals named a community in Colorado Idaho Springs. However, the name Idaho did not fall into obscurity, the same year Congress created Colorado Territory, a county called Idaho County was created in eastern Washington Territory. The county was named after a steamship named Idaho, which was launched on the Columbia River in 1860 and it is unclear whether the steamship was named before or after Willings claim was revealed. Regardless, a portion of Washington Territory, including Idaho County, was used to create Idaho Territory in 1863. Despite this lack of evidence for the origin of the name, the name Idaho may be derived from the Plains Apache word ídaahę́, which means enemy. The Comanches used this word to refer to the Idaho Territory, a 1956 Idaho history textbook says, Idaho is a Shoshoni Indian exclamation. The word consists of three parts, the first is Ee, which in English conveys the idea of coming down
Idaho
–
Digitally colored elevation map of Idaho.
Idaho
–
Flag
Idaho
–
Shoshone Falls in south central Idaho.
Idaho
–
Reynolds Creek Experimental Watershed in the Owyhee Mountains, about 50 miles (80 km) southwest of
Boise, Idaho
13.
Utah
–
The Utah Railway is a class III railroad operating in Utah and Colorado, and owned by Genesee & Wyoming Inc. The Utah Railway Company was incorporated on January 24,1912, with the name of Utah Coal Railway, shortened to Utah Railway in May of the same year. It was founded to haul coal from the mines to Provo, Utah, in reaction to company disappointment in the service and route of the existing Denver. In addition, the Utah Railway was the first to equip its air brakes with fourteen-pound tension springs instead of the standard seven-pound springs and these gondolas were known to the railroads employees as Battleships. Parent company Mueller Industries, a manufacturer of products, sold the Utah Railway in 2002 to Genesee & Wyoming Inc. a railroad holding company. As of January,2017, the no longer hauls coal. The Utah Railway also owns a railroad, the Salt Lake City Southern Railroad. In addition, switching services are provided in Ogden and elsewhere, the earliest logo was simply the words Utah Railway Company, spelled out on the locomotives and cabooses, and Utah Coal Route on the drop-bottom gondolas. On paper, however, the logo for many years was a circle with a white background. The wording and image in these circular logos changed over the years, the 1948 logo included the words Utah Railway surrounding a gondola with the initials U. C. R. The 1999 logo was an oval with an image of an SD diesel locomotive, in later years the symbol of the Utah Railway Company was the beehive, which is also the Utah state symbol. Genesee & Wyoming corporate website Trainwebs Utah Railway UtahRails. net Utah Railway page
Utah
–
Former Union Pacific CA-1
Caboose on display in
Helper. The Utah Railway purchased eight of these cabooses from the UP between 1918 and 1927.
Utah
14.
Nevada
–
Nevada is a state in the Western, Mountain West, and Southwestern regions of the United States of America. Nevada is the 7th most extensive, the 34th most populous, nearly three-quarters of Nevadas people live in Clark County, which contains the Las Vegas–Paradise metropolitan area where three of the states four largest incorporated cities are located. Nevada is officially known as the Silver State because of the importance of silver to its history and economy. It is also known as the Battle Born State, because it achieved statehood during the Civil War, as the Sage-brush State, for the plant of the same name. Nevada borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, Nevada is largely desert and semi-arid, much of it located within the Great Basin. Areas south of the Great Basin are located within the Mojave Desert, while Lake Tahoe, about 86% of the states land is managed by various jurisdictions of the U. S. federal government, both civilian and military. Before European contact, Native Americans of the Paiute, Shoshone, the first Europeans to explore the region were Spanish. They called the region Nevada because of the snow covered the mountains in winter. The area formed part of the Viceroyalty of New Spain, the United States annexed the area in 1848 after its victory in the Mexican–American War, and it was incorporated as part of Utah Territory in 1850. The discovery of silver at the Comstock Lode in 1859 led to a boom that became an impetus to the creation of Nevada Territory out of western Utah Territory in 1861. Nevada became the 36th state on October 31,1864, as the second of two added to the Union during the Civil War. Nevada has a reputation for its libertarian laws, in 1940, with a population of just over 110,000 people, Nevada was by far the least-populated state, with less than half the population of the next least-populated state. However, legalized gambling and lenient marriage and divorce laws transformed Nevada into a major tourist destination in the 20th century, Nevada is the only U. S. state where prostitution is legal, though it is illegal in Clark County, Washoe County and Carson City. The tourism industry remains Nevadas largest employer, with mining continuing as a sector of the economy. The name Nevada comes from the Spanish nevada, meaning snow-covered, most Nevadans pronounce the second syllable of their state name using the vowel of trap. Many from outside the Western United States pronounce it with the vowel of father, although the latter pronunciation is closer to the Spanish pronunciation, it is not the pronunciation preferred by most Nevadans. State Assemblyman Harry Mortenson proposed a bill to recognize the alternate pronunciation of Nevada, though the bill was not supported by most legislators, the Nevadan pronunciation is the de facto official one, since it is the one used by the state legislature. Nevada is almost entirely within the Basin and Range Province, and is broken up by many mountain ranges
Nevada
–
The quartzite of the Prospect Mountain Formation on top of Jeff Davis Peak in
Great Basin National Park
Nevada
–
Flag
Nevada
–
Mountains west of Las Vegas in the
Mojave Desert
Nevada
–
Vegetation at Timber Creek in the
Schell Creek Range
15.
California
–
California is the most populous state in the United States and the third most extensive by area. Located on the western coast of the U. S, California is bordered by the other U. S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. Los Angeles is Californias most populous city, and the second largest after New York City. The Los Angeles Area and the San Francisco Bay Area are the nations second- and fifth-most populous urban regions, California also has the nations most populous county, Los Angeles County, and its largest county by area, San Bernardino County. The Central Valley, an agricultural area, dominates the states center. What is now California was first settled by various Native American tribes before being explored by a number of European expeditions during the 16th and 17th centuries, the Spanish Empire then claimed it as part of Alta California in their New Spain colony. The area became a part of Mexico in 1821 following its war for independence. The western portion of Alta California then was organized as the State of California, the California Gold Rush starting in 1848 led to dramatic social and demographic changes, with large-scale emigration from the east and abroad with an accompanying economic boom. If it were a country, California would be the 6th largest economy in the world, fifty-eight percent of the states economy is centered on finance, government, real estate services, technology, and professional, scientific and technical business services. Although it accounts for only 1.5 percent of the states economy, the story of Calafia is recorded in a 1510 work The Adventures of Esplandián, written as a sequel to Amadis de Gaula by Spanish adventure writer Garci Rodríguez de Montalvo. The kingdom of Queen Calafia, according to Montalvo, was said to be a land inhabited by griffins and other strange beasts. This conventional wisdom that California was an island, with maps drawn to reflect this belief, shortened forms of the states name include CA, Cal. Calif. and US-CA. Settled by successive waves of arrivals during the last 10,000 years, various estimates of the native population range from 100,000 to 300,000. The Indigenous peoples of California included more than 70 distinct groups of Native Americans, ranging from large, settled populations living on the coast to groups in the interior. California groups also were diverse in their organization with bands, tribes, villages. Trade, intermarriage and military alliances fostered many social and economic relationships among the diverse groups, the first European effort to explore the coast as far north as the Russian River was a Spanish sailing expedition, led by Portuguese captain Juan Rodríguez Cabrillo, in 1542. Some 37 years later English explorer Francis Drake also explored and claimed a portion of the California coast in 1579. Spanish traders made unintended visits with the Manila galleons on their trips from the Philippines beginning in 1565
California
–
A forest of redwood trees in
Redwood National Park
California
–
Flag
California
–
Mount Shasta
California
–
Aerial view of the
California Central Valley
16.
Baja California
–
Baja California, officially the Free and Sovereign State of Baja California, is a state in Mexico. It is the northernmost and westernmost of the 32 Federal Entities of Mexico, before becoming a state in 1952, the area was known as the North Territory of Baja California. It has an area of 70,113 km2, or 3. 57% of the mass of Mexico and comprises the northern half of the Baja California Peninsula, north of the 28th parallel. The mainland portion of the state is bordered on the west by the Pacific Ocean, on the east by Sonora, the U. S. State of Arizona, and the Gulf of California and its northern limit is the U. S. state of California. The state has an population of 3,165,776 much more than the sparsely populated Baja California Sur to the south. Over 75% of the lives in the capital city, Mexicali, in Ensenada. Other important cities include San Felipe, Rosarito and Tecate, additionally, there is a large immigrant population from the United States due to its proximity to San Diego and the cheaper cost of living compared to San Diego. There is also a significant population from Central America, many immigrants moved to Baja California for a better quality of life and the number of higher paying jobs in comparison to the rest of Mexico and Latin America. Baja California is the twelfth largest state by area in Mexico and its geography ranges from beaches to forests and deserts. The backbone of the state is the Sierra de Baja California, where the Picacho del Diablo and this mountain range effectively divides the weather patterns in the state. In the northwest, the weather is semi-dry and mediterranean, in the narrow center, the weather changes to be more humid due to altitude. It is in area where a few valleys can be found, such as the Valle de Guadalupe. To the east of the range, the Sonoran Desert dominates the landscape. In the south, the weather becomes drier and gives way to the Vizcaino Desert, the state is also home to numerous islands off both of its shores. In fact, the westernmost point in Mexico, the Guadalupe Island, is part of Baja California, the Coronado, Todos Santos and Cedros Islands are also on the Pacific Shore. On the Gulf of California, the biggest island is the Angel de la Guarda, separated from the peninsula by the deep, the first people came to the peninsula at least 11,000 years ago. At that time two main groups are thought to have been present on the peninsula. In the south were the Cochimí, in the north were several groups belonging to the Yuman language family, including the Kiliwa, Paipai, Kumeyaay, Cocopa, and Quechan
Baja California
–
Central Desert in Cataviña
Baja California
–
Flag
Baja California
–
Isla Partida, which is part of the
San Lorenzo Marine Archipelago National Park
Baja California
–
Sierra de San Pedro Martir, with Picacho del Diablo in the center.
17.
Contiguous United States
–
The contiguous United States consists of the 48 adjoining U. S. states plus Washington, D. C. on the continent of North America. S. The greatest distance entirely within the 48 contiguous states is 2,802 miles, the greatest north-south line is 1,650 miles. Together, the 48 contiguous states and Washington, D. C. occupy an area of 3,119,884.69 square miles. Of this area,2,959,064.44 square miles is land, composing 83. 65% of U. S. land area, officially,160,820.25 square miles is water area, composing 62. 66% of the nations total water area. The contiguous United States would be placed 5th in the list of states and dependencies by area. The 2010 census population of area was 306,675,006, comprising 99. 33% of the nations population. While conterminous U. S. has the meaning of contiguous U. S. other terms commonly used to describe the 48 contiguous states have a greater degree of ambiguity. The term was in use prior to the admission of Alaska and Hawaii as states of the United States, the District of Columbia is not always specifically mentioned as being part of CONUS. OCONUS is derived from CONUS with O for outside added, thus referring to Outside of Continental United States, the term Lower 48 is also used to refer to the conterminous United States. The National Geographic style guide recommends the use of contiguous or conterminous United States instead of lower 48 when the 48 states are meant, both Alaskans and Hawaiians have unique labels for the contiguous United States because of their own locations relative to them. Alaska became the 49th state of the United States on January 3,1959, Alaska is on the northwest end of the North American continent, but separated from the rest of the United States Pacific coast by the Canadian province of British Columbia. In Alaska, given the ambiguity surrounding the usage of continental, several other terms have been used over the years. Hawaii became the 50th state of the United States on August 21,1959 and it is the southernmost and so far, the latest state to join the Union. Not part of any continent, Hawaii is located in the Pacific Ocean, about 2,200 miles from North America, in Hawaii and overseas American territories, for instance, the terms the Mainland or U. S. Mainland are often used to refer to the continental United States, apart from off-shore US islands, a few continental portions of the contiguous US are accessible by road only by traveling through Canada. Point Roberts, Washington, Elm Point, Minnesota, and the Northwest Angle in Minnesota are three such places, alburgh, Vermont, is not directly connected by land, but is accessible by road via bridges from within Vermont and from from New York. The 48 contiguous United States are, Washington, D. C. is distinct from the state of Washington, extreme points of the United States Mainland Definition of continental Definition of contiguous Definition of coterminous and conterminous
Contiguous United States
–
This map shows the contiguous
United States and in insets at the lower left, the two states that are not contiguous
18.
Physical geography
–
Physical geography is one of the two major sub-fields of geography. Geomorphology seeks to understand landform history and dynamics, and predict future changes through a combination of observation, physical experiment. Thus the field encompasses water in rivers, lakes, aquifers and to an extent glaciers, in which the field examines the process and dynamics involved in these bodies of water. Similar to most fields of physical geography it has sub-fields that examine the bodies of water or their interaction with other spheres e. g. limnology and ecohydrology. Glaciology is the study of glaciers and ice sheets, or more commonly the cryosphere or ice, glaciology groups the latter as continental glaciers and the former as alpine glaciers. Glaciology also has a vast array of sub-fields examining the factors and processes involved in ice sheets and glaciers e. g. snow hydrology, Biogeography is the science which deals with geographic patterns of species distribution and the processes that result in these patterns. The main stimulus for the field since its founding has been that of evolution, plate tectonics, climatology examines both the nature of micro and macro climates and the natural and anthropogenic influences on them. The field is also sub-divided largely into the climates of various regions, meteorology is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and short term forecasting. Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century, meteorological phenomena are observable weather events which illuminate and are explained by the science of meteorology. Pedology is the study of soils in their natural environment and it is one of two main branches of soil science, the other being edaphology. Pedology mainly deals with pedogenesis, soil morphology, soil classification, palaeogeography is a cross-disciplinary study that examines the preserved material in the stratigraphic record to determine the distribution of the continents through geologic time. Almost all the evidence for the positions of the continents comes from geology in the form of fossils or paleomagnetism, the use of this data has resulted in evidence for continental drift, plate tectonics, and supercontinents. This, in turn, has supported palaeogeographic theories such as the Wilson cycle, coastal geography is the study of the dynamic interface between the ocean and the land, incorporating both the physical geography and the human geography of the coast. It involves an understanding of coastal weathering processes, particularly wave action, sediment movement and weathering, coastal geography, although predominantly geomorphological in its research, is not just concerned with coastal landforms, but also the causes and influences of sea level change. Oceanography is the branch of geography that studies the Earths oceans. These diverse topics reflect multiple disciplines that oceanographers blend to further knowledge of the world ocean, Quaternary science is an inter-disciplinary field of study focusing on the Quaternary period, which encompasses the last 2.6 million years. The field was founded by the German geographer Carl Troll. Landscape ecology typically deals with problems in an applied and holistic context, geomatics is the field of gathering, storing, processing, and delivering geographic information, or spatially referenced information
Physical geography
–
True-color image of the Earth's surface and atmosphere. NASA
Goddard Space Flight Center image.
Physical geography
–
A
natural arch.
Physical geography
–
Alexander von Humboldt, considered to be the founding father of physical geography.
Physical geography
–
Biogeography
19.
Biome
–
A biome /ˈbaɪoʊm/ is a community of plants and animals that have common characteristics for the environment they exist in, and can be found over a range of continents. Spanning continents, biomes are distinct biological communities that have formed in response to a shared physical climate, biome is a broader term than habitat, any biome can comprise a variety of habitats. While a biome can cover large ares, a microbiome is a mix of organisms that coexist in a space as well. For example, the microbiome is the collection of bacteria, viruses. The biotas of the Earth make up the biosphere, the term was suggested in 1916 by Clements, originally as a synonym for biotic community of Möbius. In 1935, Tansley added the climatic and soil aspects to the idea, the International Biological Program projects popularized the concept of biome. However, in contexts, the term biome is used in a different manner. Both includes many biomes in fact and their boundaries must therefore be drawn arbitrarily and their characterization made according to the average conditions that predominate in them. A1978 study on North American grasslands found a positive correlation between evapotranspiration in mm/yr and above-ground net primary production in g/m2/yr. These findings help explain the categories used in Holdridge’s bioclassification scheme, Holdridge uses the four axes to define 30 so-called humidity provinces, which are clearly visible in his diagram. While this scheme largely ignores soil and sun exposure, Holdridge acknowledged that these were important and his scheme can be seen as a simplification of Holdridges, more readily accessible, but missing Holdridges greater specificity. Whittaker based his approach on theoretical assertions and empirical sampling and he was in a unique position to make such a holistic assertion because he had previously compiled a review of biome classifications. Physiognomy, the apparent characteristics, outward features, or appearance of communities or species. Biome, a grouping of terrestrial ecosystems on a continent that are similar in vegetation structure, physiognomy, features of the environment. Formation, a kind of community of plants on a given continent. Biome-type, grouping of convergent biomes or formations of different continents, whittakers distinction between biome and formation can be simplified, formation is used when applied to plant communities only, while biome is used when concerned with both plants and animals. Whittakers convention of biome-type or formation-type is simply a method to categorize similar communities. Whittaker considered four main ecoclines in the terrestrial realm, changes in physiognomic complexity vary with how favorable of an environment exists
Biome
–
The distribution of vegetation types as a function of mean annual temperature and precipitation.
20.
Ecoregion
–
An ecoregion is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than an ecozone. All three of these are less or greater than an ecosystem. Ecoregions cover relatively large areas of land or water, and contain characteristic, the biodiversity of flora, fauna and ecosystems that characterise an ecoregion tends to be distinct from that of other ecoregions. Three caveats are appropriate for all bio-geographic mapping approaches, firstly, no single bio-geographic framework is optimal for all taxa. Ecoregions reflect the best compromise for as many taxa as possible, secondly, ecoregion boundaries rarely form abrupt edges, rather, ecotones and mosaic habitats bound them. Thirdly, most ecoregions contain habitats that differ from their assigned biome, biogeographic provinces may originate due to various barriers. Some physical, some climatic and some ocean chemical related, the history of the term is somewhat vague as it was used in many contexts, forest classifications, biome classifications, biogeographic classifications, etc. The concept of ecoregion of Bailey gives more importance to ecological criteria, while the WWF concept gives more importance to biogeography, there is significant, but not absolute, spatial correlation among these characteristics, making the delineation of ecoregions an imperfect science. Such transition zones are called ecotones, Ecoregions can be categorized using an algorithmic approach or a holistic, “weight-of-evidence” approach where the importance of various factors may vary. An example of the approach is Robert Bailey’s work for the U. S. The intended purpose of ecoregion delineation may affect the method used, according to WWF, the boundaries of an ecoregion approximate the original extent of the natural communities prior to any major recent disruptions or changes. WWF has identified 867 terrestrial ecoregions, and approximately 450 freshwater ecoregions across the Earth, the use of the term ecoregion is an outgrowth of a surge of interest in ecosystems and their functioning. In particular, there is awareness of issues relating to spatial scale in the study and it is widely recognized that interlinked ecosystems combine to form a whole that is greater than the sum of its parts. The Global 200 is the list of ecoregions identified by WWF as priorities for conservation, Terrestrial ecoregions are land ecoregions, as distinct from freshwater and marine ecoregions. In this context, terrestrial is used to mean of land, WWF ecologists currently divide the land surface of the Earth into 8 major ecozones containing 867 smaller terrestrial ecoregions. The WWF effort is a synthesis of previous efforts to define. Many consider this classification to be decisive, and some propose these as stable borders for bioregional democracy initiatives. The eight terrestrial ecozones follow the major floral and faunal boundaries, identified by botanists and zoologists, ecozone boundaries generally follow continental boundaries, or major barriers to plant and animal distribution, like the Himalayas and the Sahara
Ecoregion
–
A map location of the
Amazon rainforest ecoregions. The yellow line encloses the ecoregions per the World Wide Fund for Nature.
Ecoregion
–
A map of North America's Bioregions
Ecoregion
–
The
Ötztal Alps, a
mountain range in the central
Alps of
Europe, are part of the
Central Eastern Alps, and can both be termed as ecoregions.
Ecoregion
–
A conifer forest in the
Swiss Alps (
National Park).
21.
Desert
–
A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation, about one third of the land surface of the world is arid or semi-arid. This includes much of the regions where little precipitation occurs. Deserts can be classified by the amount of precipitation falls, by the temperature that prevails. Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks which consequently break in pieces, although rain seldom occurs in deserts, there are occasional downpours that can result in flash floods. Rain falling on hot rocks can cause them to shatter and the resulting fragments and this picks up particles of sand and dust and wafts them aloft in sand or dust storms. Wind-blown sand grains striking any solid object in their path can abrade the surface, rocks are smoothed down, and the wind sorts sand into uniform deposits. The grains end up as level sheets of sand or are piled high in billowing sand dunes, other deserts are flat, stony plains where all the fine material has been blown away and the surface consists of a mosaic of smooth stones. These areas are known as desert pavements and little further erosion takes place, other desert features include rock outcrops, exposed bedrock and clays once deposited by flowing water. Temporary lakes may form and salt pans may be left when waters evaporate, there may be underground sources of water in the form of springs and seepages from aquifers. Where these are found, oases can occur, plants and animals living in the desert need special adaptations to survive in the harsh environment. Plants tend to be tough and wiry with small or no leaves, water-resistant cuticles, some annual plants germinate, bloom and die in the course of a few weeks after rainfall while other long-lived plants survive for years and have deep root systems able to tap underground moisture. Animals need to cool and find enough food and water to survive. Many are nocturnal and stay in the shade or underground during the heat of the day and they tend to be efficient at conserving water, extracting most of their needs from their food and concentrating their urine. Some animals remain in a state of dormancy for long periods and they then reproduce rapidly while conditions are favorable before returning to dormancy. People have struggled to live in deserts and the surrounding lands for millennia. Nomads have moved their flocks and herds to wherever grazing is available, the cultivation of semi-arid regions encourages erosion of soil and is one of the causes of increased desertification. Many trade routes have been forged across deserts, especially across the Sahara Desert, large numbers of slaves were also taken northwards across the Sahara
Desert
–
Valle de la Luna (« Valley of the Moon ») in the
Atacama Desert of
Chile, the world's driest hot desert
Desert
–
Sand dunes in the
Rub' al Khali ("Empty quarter") of
Saudi Arabia
Desert
–
Cold desert: snow surface at Dome C Station, Antarctica
Desert
–
The
Agasthiyamalai hills cut off
Tirunelveli in
India from the
monsoons, creating a
rainshadow region.
22.
Great Basin Desert
–
The Great Basin Desert is part of the Great Basin between the Sierra Nevada and the Wasatch Range. It is a desert with hot, dry summers and snowy winters. The desert spans a large part of the state of Nevada, and extends into western Utah, eastern California, the desert is one of the four biologically defined deserts in North America, in addition to the Mojave, Sonoran, and Chihuahuan Deserts. Basin and range topography characterizes the desert, wide valleys bordered by mountain ranges generally oriented north-south. There are more than 33 peaks within the desert with summits higher than 9,800 feet, the biological communities of the Great Basin Desert vary according to altitude, from low salty dry lakes, up through rolling sagebrush valleys, to pinyon-juniper forests. According to Grayson, more than 600 species of live in the floristic Great Basin. Sixty-three of these species have been identified as species of concern due to contracting natural habitats. The ecology of the desert varies across geography, also, different locations in the desert have different amounts of precipitation, depending on the strength of these rain shadows. The environment is influenced by Pleistocene lakes that dried after the last ice age, Lake Lahontan, each of these lakes left different amounts of salinity and alkalinity. The Great Basin Desert is defined by its animals and plants, scientists have different definitions of the Great Basin Desert, which are often defined by negatives. J. Robert Macey defines the Great Basin scrub desert as lacking creosote bush, the Great Basin Desert includes several arid basins lacking Larrea tridentata such as the Chalfant, Hammil, Benton, and Queen valleys, as well as all but the southeast portion of the Owens Valley. Conversely, the Panamint, Saline, and Eureka valleys have creosote bush, the study and definition of ecoregions can also indicate the boundaries of the Great Basin Desert. In 1987, J. M. Omernik defined a desert ecoregion between the Sierra Nevada and Wasatch Range, naming it the Northern Basin and Range ecoregion. In 1999, the U. S. EPA renamed the Northern Basin and Range to Central Basin and Range and he states that the Great Basin Desert is encompassed within that area. This article describes the ecology of the region, including the high-elevation areas. See Great Basin montane forests for more details on the high-elevation ecoregion. This is the climate of the high desert, the Great Basin desert climate begins with the Sierra Nevada in eastern California. Rising 14,000 feet above sea level, this mountain range casts a rain shadow over the desert
Great Basin Desert
–
Central Basin and Range from space (central-west
Nevada region, view due-south)
Great Basin Desert
–
Ecoregions as currently delineated by the Environmental Protection Agency and World Wildlife Fund
Great Basin Desert
–
A rain shadow
Great Basin Desert
–
Valley bottom at
Ash Meadows National Wildlife Refuge
23.
Hydrography
–
The origins of hydrography lay in the making of charts to aid navigation, by individual mariners as they navigated into new waters. These were usually the property, even closely held secrets. National organizations, particularly navies, realized that the collection, systematization and distribution of this gave it great organizational. Thus were born dedicated national hydrographic organizations for the collection, organization, publication and distribution of hydrography incorporated into charts, prior to the establishment of the United Kingdom Hydrographic Office, Royal Navy captains were responsible for the provision of their own charts. In practice this meant that ships often sailed with inadequate information for safe navigation, and that when new areas were surveyed, the Admiralty appointed Alexander Dalrymple as Hydrographer in 1795, with a remit to gather and distribute charts to HM Ships. Within a year existing charts from the two centuries had been collated, and the first catalogue published. The first chart produced under the direction of the Admiralty, was a chart of Quiberon Bay in Brittany, under Captain Thomas Hurd the department received its first professional guidelines and the first catalogues were published and made available to the public and to other nations as well. In 1829, Rear-Admiral Sir Francis Beaufort, as Hydrographer, developed the eponymous Scale, and introduced the first official tide tables in 1833, the word hydrography comes from the Ancient Greek ὕδωρ, water and γράφω, to write. The science of oceanography is, in part, an outgrowth of classical hydrography, in many respects the data are interchangeable, but marine hydrographic data will be particularly directed toward marine navigation and safety of that navigation. Marine resource exploration and exploitation is a significant application of hydrography, hydrographical measurements include the tidal, current and wave information of physical oceanography. Bottom measurements also include collection of the nature of the bottom as it pertains to effective anchoring, unlike oceanography, hydrography will include shore features, natural and manmade, that aid in navigation. Hydrography, mostly for reasons of safety, adopted a number of conventions that have affected its portrayal of the data on nautical charts, the former are the mariners tools to avoid accident. The latter are best representations of the seabed, as in a topographic map, for scientific. Trends in hydrographic practice since c, 2003–2005 have led to a narrowing of this difference, with many more hydrographic offices maintaining best observed databases, and then making navigationally safe products as required. This has been coupled with a preference for multi-use surveys, so that the data collected for nautical charting purposes can also be used for bathymetric portrayal. For instance, if there is an area that can not be reached because it is surrounded by shallow water. The color filled areas that show different ranges of water are not the equivalent of contours on a topographic map since they are often drawn seaward of the actual shallowest depth portrayed. A bathymetric chart does show marine topology accurately, details covering the above limitations can be found in Part 1 of Bowditchs American Practical Navigator
Hydrography
–
HMS Waterwitch, a hydrographic survey vessel
Hydrography
–
Table of geography, hydrography, and navigation, from the 1728
Cyclopaedia.
Hydrography
–
Alexander Dalrymple, the first
Hydrographer of the Navy in the
United Kingdom, appointed in 1795.
Hydrography
–
Biogeography
24.
Ecology
–
Ecology is the scientific analysis and study of interactions among organisms and their environment. It is a field that includes biology, geography. Ecology includes the study of interactions that organisms have with other, other organisms. Ecosystems are composed of dynamically interacting parts including organisms, the communities make up. Ecosystem processes, such as production, pedogenesis, nutrient cycling. These processes are sustained by organisms with specific life history traits, biodiversity, which refers to the varieties of species, genes, and ecosystems, enhances certain ecosystem services. Ecology is not synonymous with environment, environmentalism, natural history and it is closely related to evolutionary biology, genetics, and ethology. An important focus for ecologists is to improve the understanding of how biodiversity affects ecological function, Ecology is a human science as well. For example, the Circles of Sustainability approach treats ecology as more than the environment out there and it is not treated as separate from humans. Organisms and resources compose ecosystems which, in turn, maintain biophysical feedback mechanisms that moderate processes acting on living and non-living components of the planet, the word ecology was coined in 1866 by the German scientist Ernst Haeckel. Ecological thought is derivative of established currents in philosophy, particularly from ethics and politics, ancient Greek philosophers such as Hippocrates and Aristotle laid the foundations of ecology in their studies on natural history. Modern ecology became a more rigorous science in the late 19th century. Evolutionary concepts relating to adaptation and natural selection became the cornerstones of modern ecological theory, the scope of ecology contains a wide array of interacting levels of organization spanning micro-level to a planetary scale phenomena. Ecosystems, for example, contain abiotic resources and interacting life forms, an ecosystems area can vary greatly, from tiny to vast. A single tree is of consequence to the classification of a forest ecosystem. Several generations of a population can exist over the lifespan of a single leaf. Each of those aphids, in turn, support diverse bacterial communities, biodiversity describes the diversity of life from genes to ecosystems and spans every level of biological organization. The term has several interpretations, and there are ways to index, measure, characterize
Ecology
–
Ecology
Ecology
Ecology
Ecology
25.
Floristic province
–
A phytochorion, in phytogeography, is a geographic area with a relatively uniform composition of plant species. Adjacent phytochoria do not usually have a boundary, but rather a soft one. The region of overlap is called a tension zone. However, some prefer not to rank areas, referring to them simply as areas. Systems used to classify vegetation can be divided in two groups, those that use physiognomic-environmental parameters and characteristics and those that are based on floristic relationships. Several systems of classifying geographic areas where plants grow have been devised, most systems are organized hierarchically, with the largest units subdivided into smaller geographic areas, which are made up of smaller floristic communities, and so on. Phytochoria are defined as possessing a large number of endemic taxons. Floristic kingdoms are characterized by a degree of family endemism, floristic regions by a high degree of generic endemism. In the late 19th century, Adolf Engler was the first to make a map with the limits of distribution of floras. His Syllabus der Pflanzenfamilien, from the third onwards, also included a sketch of the division of the earth into floral regions. Other important early works on floristics includes Augustin de Candolle, Schouw, Alphonse de Candolle, Drude, botanist Ronald Good identified six floristic kingdoms, the largest natural units he determined for flowering plants. Goods six kingdoms are subdivided into units, called provinces. The Paleotropical kingdom is divided into three subkingdoms, which are subdivided into floristic provinces. Each of the five kingdoms are subdivided directly into provinces. There are a total of 37 floristic provinces, almost all provinces are further subdivided into floristic regions. Armen Takhtajan, in a widely used scheme that builds on Goods work, identified thirty-five floristic regions, each of which is subdivided into floristic provinces, guide to Standard Floras of the World. An annotated, geographically arranged systematic bibliography of the principal floras, enumerations, checklists, 2nd ed. pp. xxiv,1100. Cambridge University Press, Cambridge
Floristic province
–
Floristic kingdoms
26.
Topography
–
Topography is the study of the shape and features of the surface of the Earth and other observable astronomical objects including planets, moons, and asteroids. The topography of an area could refer to the shapes and features themselves. This field of geoscience and planetary science is concerned with detail in general, including not only relief but also natural and artificial features. This meaning is common in the United States, where topographic maps with elevation contours have made topography synonymous with relief. The older sense of topography as the study of place still has currency in Europe, topography in a narrow sense involves the recording of relief or terrain, the three-dimensional quality of the surface, and the identification of specific landforms. This is also known as geomorphometry, in modern usage, this involves generation of elevation data in digital form. It is often considered to include the representation of the landform on a map by a variety of techniques, including contour lines, hypsometric tints. The term topography originated in ancient Greece and continued in ancient Rome, the word comes from the Greek τόπος and -γραφία. In classical literature this refers to writing about a place or places, in Britain and in Europe in general, the word topography is still sometimes used in its original sense. Detailed military surveys in Britain were called Ordnance Surveys, and this term was used into the 20th century as generic for topographic surveys, the earliest scientific surveys in France were called the Cassini maps after the family who produced them over four generations. The term topographic surveys appears to be American in origin, the earliest detailed surveys in the United States were made by the “Topographical Bureau of the Army, ” formed during the War of 1812, which became the Corps of Topographical Engineers in 1838. In the 20th century, the term started to be used to describe surface description in other fields where mapping in a broader sense is used. An objective of topography is to determine the position of any feature or more generally any point in terms of both a horizontal coordinate system such as latitude, longitude, and altitude, identifying features, and recognizing typical landform patterns are also part of the field. There are a variety of approaches to studying topography, which method to use depend on the scale and size of the area under study, its accessibility, and the quality of existing surveys. Work on one of the first topographic maps was begun in France by Giovanni Domenico Cassini, in areas where there has been an extensive direct survey and mapping program, the compiled data forms the basis of basic digital elevation datasets such as USGS DEM data. This data must often be cleaned to eliminate discrepancies between surveys, but it forms a valuable set of information for large-scale analysis. The original American topographic surveys involved not only recording of relief, remote sensing is a general term for geodata collection at a distance from the subject area. Besides their role in photogrammetry, aerial and satellite imagery can be used to identify and delineate terrain features, certainly they have become more and more a part of geovisualization, whether maps or GIS systems
Topography
–
A surveying point in
Germany
Topography
–
A topographic map with
contour intervals
27.
Ethnography
–
Ethnography is the systematic study of people and cultures. It is designed to explore cultural phenomena where the researcher observes society from the point of view of the subject of the study, an ethnography is a means to represent graphically and in writing the culture of a group. The word can thus be said to have a double meaning, the resulting field study or a case report reflects the knowledge and the system of meanings in the lives of a cultural group. The typical ethnography is a study and so includes a brief history, and an analysis of the terrain, the climate. In all cases it should be reflexive, make a contribution toward the understanding of the social life of humans, have an aesthetic impact on the reader. An ethnography records all observed behavior and describes all symbol-meaning relations, the word ethnography is derived from the Greek ἔθνος, meaning a company, later a people, nation and -graphy meaning field of study. Ethnographic studies focus on large groups of people who interact over time. Ethnography is a design, where the researcher explains about shared learnt patterns of values, behaviour, beliefs. The field of anthropology originated from Europe and England designed in late 19th century and it spread its roots to the United States at the beginning of the 20th century. Some of the main contributors like EB Tylor from Britain and Lewis H Morgan, franz Boas, Bronislaw Malinowski, Ruth Benedict and Margaret Mead, were a group of researchers from United States who contributed the idea of cultural relativism to the literature. He gives the point of the native and this became the origin of field work. Since Malinowski was very firm with his approach he applied it practically and he was interested in learning the language of the islanders and stayed there for a long time doing his field work. The field of ethnography became very popular in the late 19th century, again, in the latter part of the 19th century, the field of anthropology became a good support for scientific formation. Though the field was flourishing it had a lot of threat to encounter, post colonialism, the research climate shifted towards post-modernism and feminism. Therefore, the field of anthropology moved into discipline of social science, gerhard Friedrich Müller developed the concept of ethnography as a separate discipline whilst participating in the Second Kamchatka Expedition as a professor of history and geography. Whilst involved in the expedition, he differentiated Völker-Beschreibung as an area of study. This became known as ethnography, following the introduction of the Greek neologism ethnographia by Johann Friedrich Schöpperlin, there are different forms of ethnography, confessional ethnography, life history, feminist ethnography etc. Two popular forms of ethnography are realist ethnography and critical ethnography, realist ethnography, is a traditional approach used by cultural anthropologists
Ethnography
–
A picture of the Izmir Ethnography Museum (İzmir Etnografya Müzesi) from the courtyard.
Ethnography
–
Ethnography museum
Ethnography
–
Bronisław Malinowski among
Trobriand tribe
Ethnography
–
Part of the ethnographic collection of the
Međimurje County Museum in
Croatia
28.
Joseph R. Walker
–
This article incorporates public domain material from websites or documents of the National Park Service. Joseph R. Walker was a man and experienced scout. He established the segment of the California Trail, the route for the emigrants to the gold fields during the California gold rush, from Fort Hall. The Walker River and Walker Lake in Nevada were named for him by John C, Walker was born in Roane County, Tennessee, the fourth child of seven born to Joseph and Susan Willis Walker. In 1819, the family emigrated to Missouri, settling west of Fort Osage, in 1820, he traveled to Santa Fe and was detained for a short while by Spanish authorities. He may have one of the Taos trappers trapping beaver in the Spanish/Mexican territory of Alta California. He returned to Missouri and in 1827 was appointed sheriff of Jackson County, in 1830, Walker was driving horses to Fort Gibson in Oklahoma, where he met Benjamin Bonneville. Walker wanted to explore the American frontier, and Bonneville offered him an opportunity to him in his expeditions. In 1832, Walker left from Fort Osage with Bonneville and 110 other men, traveling to the Green River in Wyoming. In 1833, Bonneville sent Walker in command of a party of men, including Old Bill Williams, from the Green River to explore the Great Salt Lake and they left on July 27 and eventually discovered a route along the Humboldt River across present-day Nevada. They followed it to the Humboldt Sink, then made their way to present day Genoa and they began their ascent of the Sierras by traveling up the west fork of the Carson River to Hawkins Peak. At that point, they began wandering, trying to find a path to a dividing ridge and they finally made their way to the headwaters of the Stanislaus River, and descended on the ridgeline north of the river canyon. They eventually made it to the river itself, then followed it down to the Central Valley of California. On February 14,1834, Walker and his party of fifty two men left on their trip from California, crossing back over the Sierra Nevada through one of the southern passes. The group made it to Owens Valley on May 1,1834. and traveled up it and they crossed out of the valley on May 10, but soon became alarmed by the lack of water. They went back west to the base of the Sierras, and traveled north to the Humboldt Sink, at some point in the ensuing years, Walker took a Shoshone wife. In 1840 Walker and a band of followers made the first known north to south crossing of the eastern Great Basin by Americans, Walker left California with a hundred mares and an unknown number of mules. After travelling to California in the Bartleson–Bidwell Party of 1841 Joseph B, Chiles returned to western Missouri and organized the first wagon train of California bound emigrants in 1843
Joseph R. Walker
–
Joseph Walker may have been the first Euro-American to see Yosemite Valley
29.
National Park Service
–
It was created on August 25,1916, by Congress through the National Park Service Organic Act and is an agency of the United States Department of the Interior. As of 2014, the NPS employs 21,651 employees who oversee 417 units, the National Park Service celebrated its centennial in 2016. National parks and national monuments in the United States were originally individually managed under the auspices of the Department of the Interior, the movement for an independent agency to oversee these federal lands was spearheaded by business magnate and conservationist Stephen Mather, as well as J. Horace McFarland. With the help of journalist Robert Sterling Yard, Mather ran a publicity campaign for the Department of the Interior and they wrote numerous articles that praised the scenic and historic qualities of the parks and their possibilities for educational, inspirational, and recreational benefits. This campaign resulted in the creation of a National Park Service, Mather became the first director of the newly formed NPS. On March 3,1933, President Herbert Hoover signed the Reorganization Act of 1933, the act would allow the President to reorganize the executive branch of the United States government. It wasnt until later that summer when the new President, Franklin D. Roosevelt, President Roosevelt agreed and issued two Executive orders to make it happen. In 1951, Conrad Wirth became director of the National Park Service, the demand for parks after the end of the World War II had left the parks overburdened with demands that could not be met. In 1952, with the support of President Dwight D. Eisenhower, he began Mission 66, New parks were added to preserve unique resources and existing park facilities were upgraded and expanded. In 1966, as the Park Service turned 50 years old, emphasis began to turn from just saving great and wonderful scenery, Director George Hartzog began the process with the creation of the National Lakeshores and then National Recreation Areas. Since its inception in 1916, the National Park Service has managed each of the United States national parks, Yellowstone National Park was the first national park in the United States. In 1872, there was no government to manage it. Yosemite National Park began as a park, the land for the park was donated by the federal government to the state of California in 1864 for perpetual conservation. Yosemite was later returned to federal ownership, at first, each national park was managed independently, with varying degrees of success. In Yellowstone, the staff was replaced by the U. S. Army in 1886. Due to the irregularities in managing these national treasures, Stephen Mather petitioned the government to improve the situation. In response, Secretary of the Interior Franklin K. Lane challenged him to lobby for creating a new agency, Mather was successful with the ratification of the National Park Service Organic Act in 1916. Later, the agency was given authority over other protected areas, the National Park System includes all properties managed by the National Park Service
National Park Service
–
In 1916, a portfolio of nine major parks was published to generate interest. Printed on each brochure was a map showing the parks and principal railroad connections.
National Park Service
–
National Park Service Arrowhead
National Park Service
–
In 1934, a series of ten postage stamps were issued to commemorate the reorganization and expansion of the National Park Service.
National Park Service
–
Grand Canyon National Park, south rim of canyon.
30.
Panhandle
–
A salient is an elongated protrusion of a geopolitical entity, such as a subnational entity or a sovereign state. While similar to a peninsula in shape, a salient is not surrounded by water on three sides and connected to a geographical mainland, instead, it is delimited by a land border on at least two sides and extends out from the larger geographical body of the administrative unit. In American English the term panhandle is often used to describe a long and narrow salient. Less common descriptors include chimney and bootheel, the term salient is derived from military salients. The term panhandle derives from the part of a cooking pan. Although Utah, like Nebraska, has a protrusion from its otherwise straight border, the six northwest Cook County, Illinois townships, outside of Chicago. The Pittsburgh, Cincinnati, Chicago and St. Louis Railway was often called the Panhandle, as it crossed the Northern Panhandle of West Virginia
Panhandle
–
Locations of panhandles within states of the USA
31.
Great Basin Floristic Province
–
The Great Basin Floristic Province is a floristic province of the Madrean Subkingdom, in the Boreal Kingdom. It is located in the Western United States, a floristic province is a concept defined by Ronald Good, in 1947, and refined by Armen Takhtajan, in 1986. A phytochorion is a region on earth that has a relative constant composition of plants, the Great Basin phytochorion is distinguished by the presence of Great Basin sagebrush, and saltbushes in genus Atriplex. The Great Basin floristic province is one geographical division scheme for the Intermountain West, amongst many, other classifications are proposed by the U. S
Great Basin Floristic Province
–
Sagebrush is indicative of the Great Basin Floristic Province
32.
Snake River Plain
–
The Snake River Plain is a geologic feature located primarily within the U. S. state of Idaho. It stretches about 400 miles westward from northwest of the state of Wyoming to the Idaho-Oregon border, the plain is a wide, flat bow-shaped depression and covers about a quarter of Idaho. Three major volcanic buttes dot the plain east of Arco, the largest being Big Southern Butte, most of Idahos major cities are in the Snake River Plain, as is much of its agricultural land. The Snake River Plain can be divided into three sections, western, central, and eastern, the western plain began to form around 11–12 Ma with the eruption of rhyolite lavas and ignimbrites. The western plain is not parallel to North American Plate motion and lies at an angle to the central. Its morphology is similar to other volcanic plateaus such as the Chilcotin Group in south-central British Columbia, the eastern Snake River Plain traces the path of the North American Plate over the Yellowstone hotspot, now centered in Yellowstone National Park. The eastern plain is a depression that cuts across Basin and Range mountain structures. It is underlain almost entirely by basalt erupted from large shield volcanoes, beneath the basalts are rhyolite lavas and ignimbrites that erupted as the lithosphere passed over the hotspot. The central Snake River plain is similar to the plain but differs by having thick sections of interbedded lacustrine and fluvial sediments. Island Park and Yellowstone Calderas formed as the result of enormous rhyolite ignimbrite eruptions, henrys Fork Caldera, measuring 18 miles by 23 miles, may be the largest symmetrical caldera in the world. The caldera formed when a dome of magma built up and then drained away, the center of the dome collapsed, leaving a caldera. Henrys Fork Caldera lies within the older and larger Island Park Caldera, younger volcanoes that erupted after passing over the hotspot covered the plain with young basalt lava flows in places, including Craters of the Moon National Monument. The Snake River Plain has a significant effect on the climate of Yellowstone National Park, over time, the Yellowstone hotspot left a 70-mile wide channel through the Rocky Mountains. This channel is in line with the gap between the Cascade Range and the Sierra Nevada, the result is a moisture channel extending from the Pacific Ocean to Yellowstone. Moisture from the Pacific Ocean streams onshore in the form of clouds, the result is a localized climate on the eastern side of the Rockies that is akin to a climate on the west slope of the Cascades or the northern Sierras. Lost streams of Idaho Snake River Snake River Plain Wilson Butte Cave The Snake River Plain Snake River Plain at Digital Atlas of Idaho
Snake River Plain
–
The
Snake River cutting through the Plain leaves many
canyons and
gorges, such as this one near
Twin Falls, Idaho
Snake River Plain
–
Snake River Plain across southern Idaho
Snake River Plain
–
The eastern Snake River Plain, image from NASA's
Aqua satellite, 2008
Snake River Plain
–
Location of Yellowstone Hotspot in Millions of Years Ago
33.
Colorado Plateau
–
The province covers an area of 337,000 km2 within western Colorado, northwestern New Mexico, southern and eastern Utah, and northern Arizona. About 90% of the area is drained by the Colorado River and its tributaries, the Green, San Juan. Most of the remainder of the plateau is drained by the Rio Grande, the Colorado Plateau is largely made up of high desert, with scattered areas of forests. In the southwest corner of the Colorado Plateau lies the Grand Canyon of the Colorado River, much of the Plateaus landscape is related, in both appearance and geologic history, to the Grand Canyon. The nickname Red Rock Country suggests the brightly colored rock left bare to the view by dryness, domes, hoodoos, fins, reefs, river narrows, natural bridges, and slot canyons are only some of the additional features typical of the Plateau. The Colorado Plateau has the greatest concentration of U. S. National Park Service units in the country outside of the Washington, DC metropolitan area. Among its ten National Parks are Grand Canyon, Glen Canyon, Zion, Bryce Canyon, Capitol Reef, Canyonlands, Arches, Mesa Verde, and Petrified Forest. The province is bounded by the Rocky Mountains in Colorado, and by the Uinta Mountains and Wasatch Mountains branches of the Rockies in northern and it is also bounded by the Rio Grande Rift, Mogollon Rim and the Basin and Range Province. Isolated ranges of the Southern Rocky Mountains such as the San Juan Mountains in Colorado, north-south trending normal faults that include the Hurricane, Sevier, Grand Wash, and Paunsaugunt separate the sections component plateaus. This fault pattern is caused by the forces pulling apart the adjacent Basin and Range province to the west. Occupying the southeast corner of the Colorado Plateau is the Datil Section, thick sequences of mid-Tertiary to late-Cenozoic-aged lava covers this section. Development of the province has in part been influenced by structural features in its oldest rocks. Part of the Wasatch Line and its various faults form the edge of the province. Faults that run parallel to the Wasatch Fault that lies along the Wasatch Range form the boundaries between the plateaus in the High Plateaus Section, the Uinta Basin, Uncompahgre Uplift, and the Paradox Basin were also created by movement along structural weaknesses in the regions oldest rock. Some sources also include the Tushar Mountain Plateau as part of the Colorado Plateau, the mostly flat-lying sedimentary rock units that make up these plateaus are found in component plateaus that are between 1500 m to over 3350 m above sea level. A supersequence of these rocks is exposed in the various cliffs, within these rocks are abundant mineral resources that include uranium, coal, petroleum, and natural gas. Study of the unusually clear geologic history has greatly advanced that science. A rain shadow from the Sierra Nevada far to the west, higher areas receive more precipitation and are covered in forests of pine, fir, and spruce
Colorado Plateau
–
The
Four Corners Monument is where the states of
Colorado,
New Mexico,
Arizona, and
Utah meet. (The states are listed in clockwise order.)
Colorado Plateau
–
A map of the Colorado Plateau.
Colorado Plateau
–
The
Four Corners region and the Colorado Plateau. Click image to see state lines.
Colorado Plateau
–
The Book Cliffs of western
Colorado.
34.
Uinta Basin
–
The Uinta Basin, is a physiographic section of the larger Colorado Plateaus province, which in turn is part of the larger Intermontane Plateaus physiographic division. It is also a structural basin in eastern Utah, east of the Wasatch Mountains. The Uinta Basin is fed by creeks and rivers flowing south from the Uinta Mountains, many of the principal rivers flow into the Duchesne River which feeds the Green River—a tributary of the Colorado River. The Uinta Mountains forms the border of the Uinta Basin. They contain the highest point in Utah, Kings Peak, with a summit 13,528 feet above sea level, the climate of the Uinta Basin is semi-arid, with occasionally severe winter cold. Father Escalantes expedition visited the Uinta Basin in September 1776, the Northern Ute Indian Reservation was established in 1861 by presidential decree. The United States opened the reservation for homesteading by non-Native Americans in 1905, the largest community in the Utah part of the Uinta Basin is Vernal. According to the U. S. Census, the population in 2010 was 9,089. Other communities in the Utah part of the region include Duchesne, Roosevelt, Altamont, Tabiona, the Uinta Basin is also the location of the Uintah and Ouray Indian Reservation, home to the Ute Tribe of the Uinta and Ouray Agency. The Ute Tribe is the source of Utahs state name, local attractions include Dinosaur National Monument, Starvation Reservoir State Park, Flaming Gorge National Recreation Area, Raven Ridge and Fantasy Canyon. The local economy, once based on agriculture and mining, has diversified, in order to move oil out of the region, a new railroad is proposed to be constructed into the basin. In addition, Utah State University operates Branch campuses at Vernal and Roosevelt, the Uintah Basin is the most northerly section of the Colorado Plateau sections. The basin is 5,000 to 10,000 ft above sea level, on the south side of the plateau the descent of 3,000 ft, to the general level of eastern Utah on the south, is made in two steps. The first is the Roan Cliffs and the second, the Book Cliffs, eastward in Colorado the two lines of cliffs are poorly distinguished. The Green River flows southward out of the Uinta Mountains to the north, crossing the Uintah Basin, the Uintah Basin forms a geologic structural basin, and is the source of commercial oil and gas production. Population, Housing Units, Area, and Density,2000, U. S. Census Bureau Utah History to Go The Uintah Basin Standard Utah State University, Uintah Basin Campus Uinta Basin
Uinta Basin
–
Freedom Bridge over Starvation Reservoir on
U.S. Route 40 in
Duchesne County, Utah.
Uinta Basin
–
Blue Mountain, east of
Jensen, Utah.
Uinta Basin
–
Drilling at night in Uintah Basin
Uinta Basin
–
The
Uinta Mountains form the northern boundary of the Uintah Basin.
35.
Arizona
–
Arizona is a state in the southwestern region of the United States. It is also part of the Western United States and the Mountain West states and it is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix, Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, Arizonas border with Mexico is 389 miles long, on the northern border of the Mexican states of Sonora and Baja California. Arizona is the 48th state and last of the states to be admitted to the Union. Historically part of the territory of Alta California in New Spain, after being defeated in the Mexican–American War, Mexico ceded much of this territory to the United States in 1848. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase, Southern Arizona is known for its desert climate, with very hot summers and mild winters. There are ski resorts in the areas of Flagstaff, Alpine, in addition to the Grand Canyon National Park, there are several national forests, national parks, and national monuments. To the European settlers, their pronunciation sounded like Arissona, the area is still known as alĭ ṣonak in the Oodham language. Another possible origin is the Basque phrase haritz ona, as there were numerous Basque sheepherders in the area, There is a misconception that the states name originated from the Spanish term Árida Zona. See also lists of counties, islands, rivers, lakes, state parks, national parks, Arizona is in the Southwestern United States as one of the Four Corners states. Arizona is the sixth largest state by area, ranked after New Mexico, of the states 113,998 square miles, approximately 15% is privately owned. The remaining area is public forest and park land, state trust land, Arizona is well known for its desert Basin and Range region in the states southern portions, which is rich in a landscape of xerophyte plants such as the cactus. This regions topography was shaped by volcanism, followed by the cooling-off. Its climate has hot summers and mild winters. The state is well known for its pine-covered north-central portion of the high country of the Colorado Plateau. Like other states of the Southwest United States, Arizona has an abundance of mountains, despite the states aridity, 27% of Arizona is forest, a percentage comparable to modern-day France or Germany. The worlds largest stand of pine trees is in Arizona
Arizona
–
Saguaro cactus flowers and buds after a wet winter. This is Arizona's official State Flower.
Arizona
–
Flag
Arizona
–
The
Horseshoe Bend of the
Colorado River.
Arizona
–
West Mitten at
Monument Valley
36.
Mogollon Rim
–
The Mogollon Rim or /mɒɡɒdʒɔːn/) is a topographical and geological feature cutting across the U. S. state of Arizona. It extends approximately 200 miles, starting in northern Yavapai County and running eastward and it forms the southern edge of the Colorado Plateau in Arizona. The Rim is an escarpment defining the southwestern edge of the Colorado Plateau and its central and most spectacular portions are characterized by high cliffs of limestone and sandstone, namely the Kaibab Limestone and Coconino Sandstone cliffs. The escarpment was created by erosion and faulting, cutting dramatic canyons into it, including Fossil Creek Canyon, the name Mogollon comes from Don Juan Ignacio Flores Mogollón, the Spanish Governor of New Mexico from 1712 to 1715. The Mogollon Rims limestones and sandstones were formed from sediments deposited in the Carboniferous, several of the Rims rock formations are also seen on the walls of the Grand Canyon. In many places, the Rim is capped or even buried by the basaltic lava flows. The uppermost sandstone stratum of the Mogollon Rim, called the Coconino Sandstone, forms spectacular white cliffs and this formation of the Permian Period is of aeolian origin and is one of the thickest sand-dune-derived sandstones on earth. Cities and towns near the Mogollon Rim include Payson, Sedona, Show Low, Alpine, the Mogollon Rim is practically bisected by Interstate 17 which runs north-to-south between Flagstaff and Phoenix. In June 2002, the portion of the Mogollon Rim was the site of Arizonas second-largest wildfire. The Mogollon Rim was also the site of the Dude fire that started on June 25,1990 and this fire grew to cover over 30,000 acres and killed six wildland firefighters. Other large fires have burned along the Mogollon Rim since 1990, and the ponderosa pine forests remain vulnerable because of past fire-suppression efforts. Western novel author Zane Grey built a cabin on the slopes of the Mogollon Rim just northeast of Payson. The cabin was restored by the Phoenix air-conditioning magnate William Goettl during the late 1960s, louis LAmours novel The Sackett Brand, set near the Mogollon Rim, includes descriptions of its cliffs. Hellsgate Wilderness Mogollon Monster Mogollon Mountains Pinyon-juniper woodland Mogollon Rim recreation, Coconino National Forest Land Use History of the Mogollon Rim, Arizona
Mogollon Rim
–
View of Mogollon Rim, east of
Pine, Arizona
Mogollon Rim
–
View from Mogollon Rim near
Payson, Arizona
Mogollon Rim
–
Site of Zane Grey's lodge
37.
United States Geological Survey
–
The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its resources. The organization has four science disciplines, concerning biology, geography, geology. The USGS is a research organization with no regulatory responsibility. The USGS is a bureau of the United States Department of the Interior, the USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, the current motto of the USGS, in use since August 1997, is science for a changing world. The agencys previous slogan, adopted on the occasion of its anniversary, was Earth Science in the Public Service. Prompted by a report from the National Academy of Sciences, the USGS was created, by a last-minute amendment and it was charged with the classification of the public lands, and examination of the geological structure, mineral resources, and products of the national domain. This task was driven by the need to inventory the vast lands added to the United States by the Louisiana Purchase in 1803, the legislation also provided that the Hayden, Powell, and Wheeler surveys be discontinued as of June 30,1879. Clarence King, the first director of USGS, assembled the new organization from disparate regional survey agencies, after a short tenure, King was succeeded in the directors chair by John Wesley Powell. Administratively, it is divided into a Headquarters unit and six Regional Units, Other specific programs include, Earthquake Hazards Program monitors earthquake activity worldwide. The National Earthquake Information Center in Golden, Colorado on the campus of the Colorado School of Mines detects the location, the USGS also runs or supports several regional monitoring networks in the United States under the umbrella of the Advanced National Seismic System. The USGS informs authorities, emergency responders, the media, and it also maintains long-term archives of earthquake data for scientific and engineering research. It also conducts and supports research on long-term seismic hazards, USGS has released the UCERF California earthquake forecast. The USGS National Geomagnetism Program monitors the magnetic field at magnetic observatories and distributes magnetometer data in real time, the USGS operates the streamgaging network for the United States, with over 7400 streamgages. Real-time streamflow data are available online, since 1962, the Astrogeology Research Program has been involved in global, lunar, and planetary exploration and mapping. USGS operates a number of related programs, notably the National Streamflow Information Program. USGS Water data is available from their National Water Information System database
United States Geological Survey
–
Clarence King, founder of the USGS
United States Geological Survey
–
Seal of the United States Geological Survey
United States Geological Survey
–
The USGS headquarters in
Reston, Virginia
United States Geological Survey
–
USGS gauging station 03221000 on the
Scioto River below
O'Shaughnessy Dam near
Dublin, Ohio
38.
Indigenous peoples of the Great Basin
–
The Indigenous Peoples of the Great Basin are Native Americans of the northern Great Basin, Snake River Plain, and upper Colorado River basin. There is very little precipitation in the Great Basin area which affects the lifestyles and cultures of the inhabitants, original inhabitants of the region may have arrived by 12,000 BCE. 9,000 BCE to 400 CE marks the Great Basin Desert Archaic Period, following by the time of the Fremont culture, Numic language-speakers, ancestors of todays Western Shoshone and both Northern and Southern Paiute peoples entered the region around the 14th century CE. The first Europeans to reach the area was the Spanish Dominguez-Escalante Expedition, Great Basin settlement was relatively free of non-Native settlers until the first Mormon settlers arrived in 1847. Within ten years, the first Indian reservation was established, in order to assimilate the native population, the Goshute Reservation was created in 1863. The attempted acculturation process included sending children to Indian schools and limiting the landbases and resources of the reservations, two Paiute prophets, Wodziwob and Wovoka, introduced the Ghost Dance in a ceremony to commune with departed loved ones and bring renewal of buffalo herds and precontact lifeways. The Ute Bear Dance emerged on the Great Basin, the Sun Dance and Peyote religion flourished in the Great Basin, as well. In 1930, the Ely Shoshone Reservation was established, followed by the Duckwater Indian Reservation in 1940, conditions for the Native American population of the Great Basin were erratic throughout the 20th century. Economic improvement emerged as a result of President Franklin Roosevelts Indian New Deal in the 1930s, while activism, nevertheless, the communities continue to struggle against chronic poverty and all of the resulting problems, unemployment, substance abuse, and high suicide rates. Different ethnic groups of Great Basin tribes share certain common elements that distinguish them from surrounding groups. All but the Washoe traditionally speak Numic languages, and tribal groups, prior to the 20th century, Great Basin peoples were predominantly hunters and gatherers. Desert Archaic or more simply The Desert Culture refers to the culture of the Great Basin tribes and this culture is characterized by the need for mobility to take advantage of seasonally available food supplies. Heavy items such as metates would be cached rather than carried from foraging area to foraging area, agriculture was not practiced within the Great Basin itself, although it was practiced in adjacent areas. Likewise, the Great Basin tribes had no permanent settlements, although winter villages might be revisited winter after winter by the group of families. In the summer, the largest group was usually the family due to the low density of food supplies. In the early period the Great Basin tribes were actively expanding to the north and east. These people, including the Bannock and Eastern Shoshone share traits with Plains Indians
Indigenous peoples of the Great Basin
–
Fremont culture petroglyphs of
big horn sheep,
Nine Mile Canyon, Utah
Indigenous peoples of the Great Basin
–
The Great Basin tribes region at the time of European contact was ~400,000 sq mi (1,000,000 km 2).
Indigenous peoples of the Great Basin
–
Ruby Snyder (
Chemehuevi), from
Parker, Arizona, 1942
Indigenous peoples of the Great Basin
–
Beaded moccasins that belonged to Chief
Washakie (
Shoshone), Wyoming, c. 1900
39.
Cultural region
–
In anthropology and geography, a cultural region, cultural sphere, cultural area or culture area refers to a geographical area with one relatively homogeneous human activity or complex of activities. These are often associated with a group and the territory it inhabits. Specific cultures often do not limit their geographic coverage to the borders of a nation state, Cultural spheres of influence may also overlap or form concentric structures of macrocultures encompassing smaller local cultures. Different boundaries may also be depending on the particular aspect of interest, such as religion and folklore vs. dress. Cultural areas are not considered equivalent to Kulturkreis, a culture area is a concept in cultural anthropology, in which a geographic region and time sequence is characterized by substantially uniform environment and culture. The concept of culture areas was originated by museum curators and ethnologists during the late 1800s as means of arranging exhibits, clark Wissler and Alfred Kroeber further developed the concept on the premise that they represent long-standing cultural divisions. The concept is criticized by some, who argue that the basis for classification is arbitrary, but other researchers disagree and the organization of human communities into cultural areas remains a common practice throughout the social sciences. The definition of culture areas is enjoying a resurgence of practical and theoretical interest as social scientists conduct research on processes of cultural globalization. A formal culture region is an area inhabited by people who have one or more traits in common, such as language, religion. It is a relatively homogeneous with regard to one or more cultural traits. The geographer who identifies a formal culture region must locate cultural borders, because cultures overlap and mix, such boundaries are rarely sharp even if only a single cultural trait is mapped so there are cultural border zones rather than lines. The zones broaden with each additional cultural trait that is considered because no two traits have the spatial distribution. As a result, instead of having clear borders, formal culture regions reveal a center or core where the traits are all present. Away from the core, the characteristics weaken and disappear. Thus, many formal culture regions display a core-periphery, in this sense, functional regions also possess a core-periphery configuration, in common with formal culture regions. Vernacular, popular or perceptual cultural regions are those perceived to exist by their inhabitants, as is evident by the widespread acceptance, some vernacular regions are based on physical environmental features, others find their basis in economic, political or historical characteristics. Vernacular regions, like most culture regions, generally lack sharp borders, and it grows out of peoples sense of belonging and identification with a particular region. They often lack the necessary for functional regions although they may be centered on a single urban node
Cultural region
–
Cultural areas of North American people at the time of European contact.
40.
Tule Valley, Utah
–
Tule Valley, also known as White Valley, is a north-south trending endorheic valley within the Great Basin, Great Basin Desert, and Basin and Range Province of west-central Utah. The central part of the valley has several knolls, the largest of which is Coyote Knolls, the White Valley name comes from the abundance of white rocks noted by James H. Simpson in 1859. These rocks are mostly Lake Bonneville marls in the valley floor, Tule Valleys most prominent feature may be Coyote Springs, an important spring system for local wildlife and feral horses which populate the valley. It is also used as a gateway to viewing and traveling toward the base of Notch Peak, a 4,450 foot carbonate rock cliff, the name Tule is a reference to a swamp plant that probably was found at Coyote Springs during early exploration of the valley. The valley itself is isolated, and only has one paved road through its southern end. There are no permanent human residents of the valley, though shepherds are known to populate it in the spring, the center of the valley is a large playa, the place where all precipitation from the drainage basin collects, since it is an isolated basin and watershed. This is the location of the lowest point in Millard County, the geology of Tule Valley consists of Quaternary alluvial sediments punctuated by chalky white Pleistocene marls. The valley is a graben in the sense that it is down-faulted by normal faults on both sides of the valley. The knolls in the valley are horsts of Silurian to Devonian carbonates, the Tule Valley hydrologic unit is an area of several Utah valleys and ridgelines of the Basin and Range Province. The endorheic watersheds volume of surface water averages 4,000 acre feet
Tule Valley, Utah
–
Shadow on the
eponymic white rocks of Tule Valley
Tule Valley, Utah
–
(view west, beyond
Sevier Lake)-Arc-shaped south Tule Valley section, (
Confusion Range to west,
House Range to east); north Tule Valley, at horizon, photo right
41.
House Range
–
The House Range is a north-south trending mountain range in Millard County, of west-central Utah. The House Range was named in 1859 by James H. Simpson and it was named by Simpson because. of its well-defined stratification and the resemblance of portions of its outline to domes, minarets, houses, and other structures. The House Range is bounded by Tule Valley to the west, Whirlwind Valley and Sevier Desert to the east, the range has three notable passes, Skull Rock Pass, Marjum Canyon, and Sand Pass. The highest point in the House Range is Swasey Peak, at 9,669 feet, other notable peaks include Notch Peak, a frequent climbing and base-jumping hotspot, and the very square Tatow Knob. It is also known for one of the tallest limestone cliffs in the world, the geology of the House Range is dominated by gray Cambrian to Devonian carbonate rock which was intruded by a pink Jurassic granitoid in the central part of the range. In the Wheeler Amphitheater, away from the intrusion, the Lagerstätte that contains the well-preserved fauna is found in the Cambrian section of the range, evidence of Lake Bonnevilles presence is found both in shorelines and white marls at the base of the range. The main structural component to the range is a large basin-bounding fault on the west side. The range is known for a fossil Lagerstätte of Cambrian age, which has an array of Burgess Shale type fauna, including Elrathia kingii, the Swasey Limestone was deposited in the Bathyuriscus–Elrathina zone. This is overlain in turn by the Bolaspidella zone Wheeler Shale and Marjum Formation, then the Cedaria zone Weeks Formation
House Range
–
Northern part of the House Range at sunset-(
Swasey Mountain section), showing the stratigraphy
House Range
–
"Spring Storm in the Great Basin" — House Range and
Tule Valley.
House Range
–
House Range
42.
Notch Peak
–
Notch Peak is a distinctive summit located on Sawtooth Mountain in the House Range, west of Delta, Utah, United States. The peak and the area are part of the Notch Peak Wilderness Study Area. Bristlecone pines, estimated to be 3,000 to 4,000 years old, are located on the ridges surrounding Notch Peak, Notch Peak is one of the highest peaks in the House Range, reaching 9,658 feet NAVD88. The northwest face of the mountain is a carbonate rock cliff with 2,200 feet of vertical rise. Overall, the summit rises about 4,450 feet above Tule Valley, the significance of this cliff is debatable, mainly because of the variation in the definition of the term cliff. It is the highest carbonate rock cliff in North America and/or the second highest pure vertical drop in the United States after El Capitan, one of the more popular uses of the area is the hike to Notch Peak so you can look down the notch in person. The summit can be reached by following a trail from the east side of the mountain in Sawtooth Canyon, the hike is about 7.5 miles round trip, with 2,600 feet elevation gain. The north face of Notch Peak is divided by a large shelf into an upper and lower wall, there are several rock climbing routes on the limestone cliffs. The Swiss Route, Direct North West Ridge, and Book of Saturdays ascend the upper wall, on the lower wall Appetite for Destruction and Western Hardman reach 900 feet of vertical. Climbing on all of these routes is adventurous with rockfall hazard, in addition to the face of Notch Peak, the granite found in the canyon below the notch is also used for climbing. This part of the House Range is chiefly made up of a passive margin sequence of Cambrian to Ordovician carbonate rocks, the top of the range is the type section for the aptly named Notch Peak Dolomite. At the base of the range is the pink/orange Notch Peak granite and monzonite, around Notch Peak, especially from the west side, white Lake Bonneville fossiliferous marls occur. Because of the intrusion, a hike up the canyon below the notch can clearly show a well-developed metamorphic aureole, also, small quantities of tungsten and placer gold have been found around the Notch Peak area
Notch Peak
–
Notch Peak Trailhead.
Notch Peak
–
Notch Peak and its geology: Grey carbonte rocks, pink monzonite, white marl
Notch Peak
–
An intrusion (Notch Peak
monzonite) inter-fingers (partly as a
dike) with highly metamorphosed host rock (
Cambrian carbonate rocks). From the canyon below the notch, near Notch Peak.
Notch Peak
–
Notch Peak at sunset.
43.
Hydrologic unit codes
–
A hydrological code or hydrologic unit code is a sequence of numbers or letters that identify a hydrological feature like a river, river reach, lake, or area like a drainage basin or catchment. One system, developed by Strahler, known as the Strahler stream order, each segment of a stream or river within a river network is treated as a node in a tree, with the next segment downstream as its parent. When two first-order streams come together, they form a second-order stream, when two second-order streams come together, they form a third-order stream, and so on. Another example is the system of assigning IDs to watersheds devised by Otto Pfafstetter, each watershed is assigned a unique number, called a Pfafsetter Code, based on its location within the overall drainage system. A comprehensive coding system is in use in Europe and this system codes from the ocean to the so-called primary catchment. The system determines a set of oceans or endorheic systems identified by a letter and these systems are subdivided into a maximum of 9 seas. The seas are numbered 1 to 9, seas lying far from the ocean, for example the Black Sea receive a higher number. The seas are delimited using the so-called definitions made by the International Hydrographic Organization in 1953, the coasts of these seas are defined clockwise from north west to south east from the strait where the sea connects to the ocean or the other seas. Subsequently every watershed along this coast is assigned a number using the Pfafstetter System and this implies that the four largest watersheds are selected and receive numbers 2,4,6, or 8. The watersheds in between the large systems receive numbers 3,5, and 7, numbers 1 and 9 are used for the small watersheds on the edges of the strait. The smaller systems can subsequently be numbered recursively or kept together for grouping purpose, landmasses are also numbered in a logical manner, along a clock-wise oriented sea. For Europe containing many inner seas this feature helps to read the relative location of an object in the sea. The United States Geological Survey created a system of hydrologic units originally called regions, sub-regions, accounting units. Each unit was assigned a unique Hydrologic Unit Code, as first implemented the system had 21 regions,221 subregions,378 accounting units, and 2,264 cataloging units. Over time the system was changed and expanded, as of 2010 there are six levels in the hierarchy, represented by hydrologic unit codes from 2 to 12 digits long, called regions, subregions, basins, subbasins, watersheds, and subwatersheds. The table below describes the systems hydrologic unit levels and their characteristics, the original delineation of units, down to subbasins, was done using 1,250,000 scale maps and data. The newer delineation work on watersheds and subwatersheds was done using 1,24,000 scale maps, as a result, the subbasin boundaries were changed and adjusted in order to conform to the higher resolution watersheds within them. Changes to subbasin boundaries resulted in changes in area sizes, therefore, older data using cataloging units may differ from newer, higher resolution data using subbasins
Hydrologic unit codes
44.
List of Great Basin watersheds
–
The Great Basin is the largest region of contiguous endorheic drainage basins in North America, and is encompassed by the Great Basin Divide. This is a list of the basins in the Great Basin that are over 500 sq mi. USDA, NRCS, National Cartography and Geospatial Center, USGS, Center for Earth Resources Observation and Science. List of rivers of the Great Basin Landforms of the Great Basin Watersheds of the United States
List of Great Basin watersheds
–
Map of the Great Basin
45.
Gulf of Mexico
–
The Gulf of Mexico is an ocean basin largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. The U. S. states of Alabama, Florida, Louisiana, Mississippi and Texas border the Gulf on the north, Atlantic and Pacific coasts, or sometimes the south coast, in juxtaposition to the Great Lakes region being the north coast. One of the seven main areas is the Gulf of Mexico basin. The Gulf of Mexico formed approximately 300 million years ago as a result of plate tectonics, the Gulfs basin is roughly oval and is approximately 810 nautical miles wide and floored by sedimentary rocks and recent sediments. It is connected to part of the Atlantic Ocean through the Florida Straits between the U. S. and Cuba, and with the Caribbean Sea via the Yucatan Channel between Mexico and Cuba, with the narrow connection to the Atlantic, the Gulf experiences very small tidal ranges. The size of the Gulf basin is approximately 1.6 million km2, almost half of the basin is shallow continental shelf waters. The basin contains a volume of roughly 2,500 quadrillion liters, the consensus among geologists who have studied the geology of the Gulf of Mexico, is that prior to the Late Triassic, the Gulf of Mexico did not exist. It was created by the collision of plates that formed Pangea. As interpreted by Roy Van Arsdale and Randel T. Cox, geologists and other Earth scientists agree in general that the present Gulf of Mexico basin originated in Late Triassic time as the result of rifting within Pangea. The rifting was associated with zones of weakness within Pangea, including sutures where the Laurentia, South American, first, there was a Late Triassic-Early Jurassic phase of rifting during which rift valleys formed and filled with continental red beds. Second, as rifting progressed through Early and Middle Jurassic time and it was at this time that tectonics first created a connection to the Pacific Ocean across central Mexico and later eastward to the Atlantic Ocean. This flooded the basin created by rifting and crustal thinning to create the Gulf of Mexico. While the Gulf of Mexico was a basin, the subsiding transitional crust was blanketed by the widespread deposition of Louann Salt. Initially, during the Late Jurassic, continued rifting widened the Gulf of Mexico and progressed to the point that sea-floor spreading, at this point, sufficient circulation with the Atlantic Ocean was established that the deposition of Louann Salt ceased. During the Late Jurassic through Early Cretaceous, the occupied by the Gulf of Mexico experienced a period of cooling. The subsidence was the result of a combination of stretching, cooling. Initially, the combination of stretching and cooling caused about 5–7 km of tectonic subsidence of the central thin transitional
Gulf of Mexico
–
Sediment in the Gulf of Mexico
Gulf of Mexico
–
Undersea
topography of the Gulf of Mexico
Gulf of Mexico
–
Fishing boats in
Biloxi
Gulf of Mexico
–
Gulf beach near Sabine Pass
46.
Pacific Ocean
–
The Pacific Ocean is the largest and deepest of the Earths oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west, the Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres. Both the center of the Water Hemisphere and the Western Hemisphere are in the Pacific Ocean, the oceans current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish circumnavigation of the world in 1521, as he encountered favourable winds on reaching the ocean. He called it Mar Pacífico, which in both Portuguese and Spanish means peaceful sea, important human migrations occurred in the Pacific in prehistoric times. Long-distance trade developed all along the coast from Mozambique to Japan, trade, and therefore knowledge, extended to the Indonesian islands but apparently not Australia. By at least 878 when there was a significant Islamic settlement in Canton much of trade was controlled by Arabs or Muslims. In 219 BC Xu Fu sailed out into the Pacific searching for the elixir of immortality, from 1404 to 1433 Zheng He led expeditions into the Indian Ocean. The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in 1513 after his expedition crossed the Isthmus of Panama and he named it Mar del Sur because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. Later, Portuguese explorer Ferdinand Magellan sailed the Pacific East to West on a Castilian expedition of world circumnavigation starting in 1519, Magellan called the ocean Pacífico because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters. The ocean was often called the Sea of Magellan in his honor until the eighteenth century, sailing around and east of the Moluccas, between 1525 and 1527, Portuguese expeditions discovered the Caroline Islands, the Aru Islands, and Papua New Guinea. In 1542–43 the Portuguese also reached Japan, in 1564, five Spanish ships consisting of 379 explorers crossed the ocean from Mexico led by Miguel López de Legazpi and sailed to the Philippines and Mariana Islands. The Manila galleons operated for two and a half centuries linking Manila and Acapulco, in one of the longest trade routes in history, Spanish expeditions also discovered Tuvalu, the Marquesas, the Cook Islands, the Solomon Islands, and the Admiralty Islands in the South Pacific. In the 16th and 17th century Spain considered the Pacific Ocean a Mare clausum—a sea closed to other naval powers, as the only known entrance from the Atlantic the Strait of Magellan was at times patrolled by fleets sent to prevent entrance of non-Spanish ships. On the western end of the Pacific Ocean the Dutch threatened the Spanish Philippines, Spain also sent expeditions to the Pacific Northwest reaching Vancouver Island in southern Canada, and Alaska. The French explored and settled Polynesia, and the British made three voyages with James Cook to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest, one of the earliest voyages of scientific exploration was organized by Spain in the Malaspina Expedition of 1789–1794. It sailed vast areas of the Pacific, from Cape Horn to Alaska, Guam and the Philippines, New Zealand, Australia, and the South Pacific. Growing imperialism during the 19th century resulted in the occupation of much of Oceania by other European powers, and later, Japan, in Oceania, France got a leading position as imperial power after making Tahiti and New Caledonia protectorates in 1842 and 1853 respectively. After navy visits to Easter Island in 1875 and 1887, Chilean navy officer Policarpo Toro managed to negotiate an incorporation of the island into Chile with native Rapanui in 1888, by occupying Easter Island, Chile joined the imperial nations
Pacific Ocean
–
Maris Pacifici by
Ortelius (1589). One of the first printed maps to show the Pacific Ocean; see also
Waldseemüller map (1507).
Pacific Ocean
–
The Pacific Ocean
Pacific Ocean
–
USS
Lexington under air attack on 8 May 1942 during the
Battle of the Coral Sea
Pacific Ocean
–
Map of the Pacific Ocean during European Exploration, circa 1702–1707.
47.
Wasatch Mountains
–
The Wasatch Range /ˈwɑːsætʃ/ is a mountain range that stretches approximately 160 miles from the Utah-Idaho border, south through central Utah in the western United States. It is the edge of the greater Rocky Mountains. The northern extension of the Wasatch Range, the Bear River Mountains, extends just into Idaho, according to the Utah History Encyclopedia, Wasatch in Ute means mountain pass or low pass over high range. According to William Bright the mountains were named for a Shoshoni leader who was named with the Shoshoni term wasattsi, since the earliest days of settlement, the majority of Utahs population has chosen to settle along the ranges western front, where numerous river drainages exit the mountains. The mountains were a source of water, timber. Today, 85% of Utahs population lives within 15 miles of the Wasatch Range and this concentration is known as the Wasatch Front and has a population of just over 2,000,000 residents. Salt Lake City lies between the Wasatch Range and the Great Salt Lake, at 11,928 feet, Mount Nebo, a triple peak rising above Nephi, Utah at the southern end of the range, is the highest peak of the Wasatch. In some places the mountains rise immediately from the base elevation of 4,330 feet to over 11,000 feet. Since they top out just below 12,000 feet, Wasatch peaks are not especially high compared to the Colorado Rockies or even the Uinta Mountains, the other main portion of the Rocky Mountains in Utah. However, they are sculpted by glaciers, yielding notably rugged and they also receive heavy falls of snow, in some places over 500 inches per year. This great snowfall, with its runoff, made possible a prosperous urban strip of some 25 cities along nearly 100 miles of mountain frontage. The Wasatch Range is home to a concentration of ski areas, with 11 stretching from Sundance in northern Utah County to Powder Mountain. There is also one ski resort in the Bear River Mountains, Park City alone is bordered by two ski resorts. Further north, Big Cottonwood Canyon features tricky climbing on quartzite, the canyons are located within 24 miles of downtown Salt Lake City and the year-round paved roadways can reach 5,000 ft higher in elevation above the city within a short distance. Dirt roads readily drivable in passenger cars with moderate clearance stretch up from Park City, Heber and these reach about 10,000 feet above sea level and provide impressive long-range high country views. Mount Nebo, the highest peak of the Wasatch, is located at the edge of the range. The Colorado Plateau comes to its northwest corner here as it meets the end of the Rocky Mountains. The range is punctuated by a series of faults, chief among them the Wasatch fault
Wasatch Mountains
–
View of the Wasatch Range from the
Salt Lake City Public Library
Wasatch Mountains
–
Mount Olympus, a prominent and recognizable mountain visible from much of the northern part of the
Salt Lake Valley
Wasatch Mountains
–
The Wasatch Mountains in the fall.
Wasatch Mountains
–
Squaw Peak over Rock Canyon at sunset as seen from BYU campus.
48.
Cascade Range
–
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades, the small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains. The highest peak in the range is Mount Rainier in Washington at 14,411 feet, the Cascades are part of the Pacific Oceans Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean. All of the eruptions in the contiguous United States over the last 200 years have been from Cascade volcanoes, the two most recent were Lassen Peak from 1914 to 1921 and a major eruption of Mount St. Helens in 1980. Minor eruptions of Mount St. Helens have also occurred since, the Cascade Range is a part of the American Cordillera, a nearly continuous chain of mountain ranges that form the western backbone of North America, Central America, and South America. The Cascades extend northward from Lassen Peak in northern California to the confluence of the Nicola, the Fraser River separates the Cascades from the Coast Mountains. The highest volcanoes of the Cascades, known as the High Cascades, dominate their surroundings and they often have a visual height of one mile or more. The highest peaks, such as the 14, 411-foot Mount Rainier, Mount Baker in Washington recorded a world-record single-season snowfall in the winter of 1998–99 with 1,140 inches. Prior to that year, Mount Rainier held the record for snow accumulation at Paradise in 1978. It is not uncommon for some places in the Cascades to have over 500 inches of snow accumulation, such as at Lake Helen. Most of the High Cascades are therefore white with snow and ice year-round, annual rainfall is as low as 9 inches on the eastern foothills due to a rain shadow effect. Beyond the eastern foothills is a plateau that was largely created 17 to 14 million years ago by the many flows of the Columbia River Basalt Group. Together, these sequences of fluid volcanic rock form the 200, 000-square-mile Columbia Plateau in eastern Washington, Oregon, the Columbia River Gorge is the only major break of the range in the United States. When the Cascades began to rise 7 million years ago in the Pliocene, as the range grew, erosion from the Columbia River was able to keep pace, creating the gorge and major pass seen today. The gorge also exposes uplifted and warped layers of basalt from the plateau, in early 1792, British navigator George Vancouver explored Puget Sound and gave English names to the high mountains he saw. Mount Baker was named for Vancouvers third lieutenant, Joseph Baker, although the first European to see it was Manuel Quimper, Mount Rainier was named after Admiral Peter Rainier. Later in 1792, Vancouver had his lieutenant William Robert Broughton explore the lower Columbia River and he named Mount Hood after Lord Samuel Hood, an admiral of the Royal Navy. Mount St. Helens was sighted by Vancouver in May 1792 and it was named for Alleyne FitzHerbert, 1st Baron St Helens, a British diplomat
Cascade Range
–
Cascades in Washington, with
Mount Rainier, the highest mountain in the range, standing at 14,411 ft (4,392 m). Seen in the background (left to right) are
Mount Adams, the peak of
Mount Hood, and
Mount St. Helens.
Cascade Range
–
Map of the Cascade Range showing major volcanic peaks
Cascade Range
–
The
Columbia Gorge marks where the
Columbia River splits the Cascade Range between the states of Washington and Oregon.
Cascade Range
–
West side view of
Mount Shuksan in summer as seen from
Artist Point in
Washington
This article incorporates public domain material from the National Park Service document "What is the Great Basin?" (retrieved on 2015-07-14).
This article incorporates 
"Great Basin". New International Encyclopedia. 1905.
"
