1.
Mount Shasta, California
–
Mount Shasta is a city in Siskiyou County, California, at about 3,600 feet above sea level on the flanks of Mount Shasta, a prominent northern California landmark. The city is less than 9 miles southwest of the summit of its namesake volcano, as of the 2010 Census the city had a population of 3,394, down from 3,624 at the 2000 census. The city of Mount Shasta is located in the Shasta Cascade area of Northern California. Visitors use the city as a base for fishing in the nearby Sacramento, McCloud and Klamath rivers, for climbing at Mount Shasta, Castle Crags or the Trinity Alps. The site of the city of Mount Shasta was within the range of the Okwanuchu tribe of Native Americans. During the 1820s, early Euro-American trappers and hunters first passed through the area, the Siskiyou Trail was based on a network of ancient Native American footpaths connecting California and the Pacific Northwest. The discovery of gold at nearby Yreka, California in 1851 dramatically increased traffic along the Siskiyou Trail, pioneer Ross McCloud built one of the first lumber mills in the area, near the site of the present Sisson Museum. The area where the town grew was known first as Strawberry Valley, the post office opened in 1870 as Berryvale. Street names honor members of Sissons family, the 1887 completion of the Central Pacific Railroad, built along the line of the Siskiyou Trail, brought a dramatic increase in tourism, lumbering, and population into Mount Shasta. This early development continued to focus on tourism and lumbering, the early 1900s saw the influx of a large number of Italian immigrants to Mount Shasta and neighboring towns, most of whom were employed in the timber industry. The city incorporated on May 31,1905, the name of the city was finalized City of Mount Shasta on November 10,1925, after a popular vote in 1922. Theosophist Guy Ballard claimed to have met Saint Germain while hiking on Mount Shasta in 1930, Mount Shasta is located at 41°1852 North, 122°1841 West, along Interstate 5 south of Weed and north of Dunsmuir, California. According to the United States Census Bureau, the city has an area of 3.8 square miles, of which 3.8 square miles is land. The typical depth to groundwater is quite shallow in the predominant alluvium, the settlement is on the distal gently sloping southwest flanks of Mount Shasta, with the chief surficial soils being Quaternary alluvium. This alluvium is adjacent to and probably underlain by volcanic clastic rock deposited by Mount Shasta in the course of its development, groundwater elevation is approximately at the elevation of the underlying native black peat soil. Where it occurs this peat, of two feet thickness, is underlain by stream deposit sands and gravels. This means that in the winter, the city gets nearly 103 inches of snowfall despite its low 3,600 feet elevation, in comparison, other towns in the region get much less snow. The Köppen climate classification is Csb, humid subtropical with dry summers, the record high temperature was 105 °F on August 7,1981, and the record low temperature was −13 °F on December 22,1990
Mount Shasta, California
–
Mount Shasta from downtown Mount Shasta, California
Mount Shasta, California
–
Location in
Siskiyou County and the state of
California
Mount Shasta, California
–
Mount Shasta Police Department and City Hall
Mount Shasta, California
–
Mountains
2.
Summit
–
A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a maximum in elevation. The topographic terms acme, apex, peak, and zenith are synonymous, the UIAA definition is that a summit is independent if it has a prominence of 30 metres or more, it is a mountain if it has a prominence of at least 300 metres. This can be summarised as follows, A pyramidal peak is an exaggerated form produced by ice erosion of a mountain top, Summit may also refer to the highest point along a line, trail, or route. In many parts of the western United States, the term refers to the highest point along a road, highway. For example, the highest point along Interstate 80 in California is referred to as Donner Summit while the highest point on Interstate 5 is Siskiyou Mountain Summit, geoid Hill List of highest mountains Maxima and minima Nadir Summit accordance Peak finder
Summit
–
The highest elevation summit, Mount Everest, shown with a climber at the summit wearing an oxygen mask. The summit is 8850 m (29,035 ft) elevation. (While the cruising altitude of jetliners is roughly 10,000 m (32,808 feet), they are pressurized.)
Summit
–
View from the summit of Switzerland's highest,
Monte Rosa
Summit
–
The summit of
Mount Damavand,
Iran, in winter
Summit
–
Jeff Davis Peak, one of the highest peaks entirely within
Nevada
3.
Topographic prominence
–
It is a measure of the independence of a summit. A peaks key col is a point on this contour line. By convention, the prominence of Mount Everest, the Earths highest mountain, is taken to equal the elevation of its summit above sea level, if the peaks prominence is P metres, to get from the summit to any higher terrain one must descend at least P metres. Together with the convention for Mount Everest, this implies that the prominence of any island or continental highpoint is equal to its elevation above sea level, for every ridge connecting the peak to higher terrain, find the lowest point on the ridge. The key col is defined as the highest of these cols, the prominence is the difference between the elevation of the peak and the elevation of the key col. The following mental exercise may illustrate the meaning of topographic prominence, imagine you are standing at the top of a peak and imagine that an imaginary sea level rises to your feet. Now slowly lower the sea level and an imaginary island appears beneath your feet. Your island will grow and will merge with other islands that emerge, the parent peak may be either close or far from the subject peak. The summit of Mount Everest is the parent peak of Aconcagua at a distance of 17,755 km, the key col may also be close or far from the subject peak. The key col for Aconcagua is the Bering Strait at a distance of 13,655 km, the key col for the South Summit of Mount Everest is about 100 m distant. Prominence is interesting to many mountaineers because it is a measurement that is strongly correlated with the subjective significance of a summit. Peaks with low prominences are either subsidiary tops of some higher summit or relatively insignificant independent summits, peaks with high prominences tend to be the highest points around and are likely to have extraordinary views. Only summits with a sufficient degree of prominence are regarded as independent mountains, for example, the worlds second-highest mountain is K2. While Mount Everests South Summit is taller than K2, it is not considered an independent mountain because it is a subsummit of the main summit, many lists of mountains take topographic prominence as a criterion for inclusion, or cutoff. John and Anne Nuttalls The Mountains of England and Wales uses a cutoff of 15 m, in the contiguous United States, the famous list of fourteeners uses a cutoff of 300 ft /91 m. Also in the U. S.2000 feet of prominence has become a threshold that signifies that a peak has major stature. This generates lists of peaks ranked by prominence, which are different from lists ranked by elevation. Such lists tend to emphasize isolated high peaks, such as range or island high points, one advantage of a prominence-ranked list is that it needs no cutoff, since a peak with high prominence is automatically an independent peak
Topographic prominence
–
Figure 3. Diagram of a mountain range showing peaks and cols, from which mountain parentage and prominences can be determined.
Topographic prominence
–
Topographic prominence of three peaks near Great Pond Mountain, Maine, USA. Red triangles mark the peaks, the lowest contour line encircling each peak are shown in black and the green dots mark the key cols. The prominences are Atkins Hill: 430 – 310 = 120 ft, Cave Hill: 570 - 530 = 40 ft, Mead Mountain: 671 - 530 = 141 ft. The parent peak of each peak is Great Pond Mountain.
4.
Topographic isolation
–
The topographic isolation of a summit is the minimum great-circle distance to a point of equal elevation, representing a radius of dominance in which the peak is the highest point. It can be calculated for small hills and islands as well as for major mountain peaks, the following sortable table lists the Earths 40 most topographically isolated summits. The nearest peak to Germanys highest mountain, the 2, 962-metre-high Zugspitze, the distance between the Zugspitze and this contour is 25.8 km, the Zugspitze is thus the highest peak for a radius of 25.8 km around. Its isolation is thus 25.8 km, because there are no higher mountains than Mount Everest, it has no definitive isolation. Many sources list its isolation as the circumference of the earth over the poles or – questionably, after Mount Everest the Aconcagua, highest mountain of the American continents, has the greatest isolation of all mountains. There is no land for 16,534 kilometres when its height is first exceeded by Tirich Mir in the Hindu Kush. Mont Blanc is the highest mountain of the Alps, the geographically nearest higher mountains are all in the Caucasus. The Kukurtlu, which rises near the Elbrus, is the peak for Mont Blanc. com Canadian Mountain Encyclopedia peakbagger. com peaklist. org peakware. com World Mountain Encyclopedia summitpost. org
Topographic isolation
–
Topographic isolation and prominence
Topographic isolation
–
1.
Mount Everest is the highest mountain peak on Earth.
Topographic isolation
–
2.
Aconcagua is the highest peak in the
Western Hemisphere.
Topographic isolation
–
3.
Mount McKinley, or
Denali, is the highest peak of
North America.
5.
North Palisade
–
North Palisade is the third highest mountain in the Sierra Nevada range of California. It is the highest peak of the Palisades group of peaks in the part of the range. It sports a small glacier and several highly prized rock climbing routes on its northeast side, North Palisade has a collection of names from the 19th century. The Wheeler Survey referred to it as Northwest Palisade in 1878, the following year, Lil Winchell called it Dusys Peak after local rancher Frank Dusy. In 1895, Bolton Brown advocated yet another name, after David Starr Jordan, senator Dianne Feinstein, supported by U. S. Senator Barbara Boxer, has introduced legislation to rename the peak as Brower Palisade, there is significant opposition to this proposal. The first ascent was made on July 25,1903 by James S. Hutchinson, Joseph Nisbet LeConte and they approached the area overland from south of the Palisades, and scouted possible routes from the summits of Marion Peak and Mount Sill. Armed with this intelligence, they planned to ascend the southwest chute of the U Notch, around 13,100 feet, they followed a northward branch of this chute, and slowly climbed a difficult system of cracks. From here they found a catwalk ledge that took them to a series of icy gullies and these gullies were blocked by a pair of chockstones, requiring class 4 moves to pass. Beyond these obstacles, they crested the southeast ridge, and climbed a series of blocks to the summit. After making this climb, LeConte is quoted as writing in a letter, put Dusys name on some less imposing mass, and give us a name to be handed down through all time. The peak has been called North Palisade since that day, North Palisade has several named subsidiary peaks. These all lie on the ridge crest, and are as follows, Polemonium Peak,14. This lies between the U-Notch and V-Notch couloirs,0.15 mi east-southeast of North Palisade, named on the USGS topographic map. The peak is named for the Polemonium eximium skypilot found in the area and this is the northwest summit of North Palisade, less than 0.1 mi from the main summit. Some climbing routes end atop this peak known for its famous Milk Bottle, about 0.25 mi northwest of North Palisade. Named on the USGS topographic map, the Sierra Club guidebook notes, This was the last 14,000 foot peak to be climbed in the Sierra. During a wild storm on the first ascent, a bolt of lightning left Jules Eichorn severely shaken, List of mountain peaks of California List of highest points in California by county The Palisades of the Sierra Nevada North Palisade
North Palisade
–
North Palisade from Windy Point (by
Ansel Adams, 1936)
North Palisade
–
Thunderbolt, Starlight, North Palisade, and Polemonium Peaks
6.
List of the highest major summits of North America
–
The following sortable table comprises the 200 highest mountain peaks of greater North America with at least 500 meters of topographic prominence. The summit of a mountain or hill may be measured in three ways, The topographic elevation of a summit measures the height of the summit above a geodetic sea level. The topographic prominence of a summit is a measure of how high the summit rises above its surroundings, the topographic isolation of a summit measures how far the summit lies from its nearest point of equal elevation. In greater North America, only Denali exceeds 6000 meters elevation, three major summits exceed 5500 meters,11 exceed 5000 meters,21 exceed 4500 meters,124 exceed 4000 meters,277 exceed 3500 meters, and 401 exceed 3000 meters elevation. Of these 200 highest major summits of North America,160 are located in the United States,30 in Canada,11 in México, six in Guatemala, and one in Costa Rica. Seven of these lie on the Canada-United States border and one lies on the México-Guatemala border. com Peakbagger. com Peaklist. org Peakware. com Summitpost. org
List of the highest major summits of North America
–
Denali in
Alaska is the
highest mountain peak of
North America. Denali is the third most
topographically prominent and third most
topographically isolated summit on Earth after
Mount Everest and
Aconcagua.
List of the highest major summits of North America
–
2.
Mount Logan in
Yukon is the highest summit of
Canada.
List of the highest major summits of North America
–
3.
Citlaltépetl is the highest summit of
Mexico.
List of the highest major summits of North America
–
4.
Mount Saint Elias is the second highest summit of both
Canada and the
United States.
7.
List of highest mountain peaks of California
–
The following sortable table comprises the 46 mountain peaks of the U. S. State of California with at least 3000 meters of topographic elevation and at least 500 meters of topographic prominence. Topographic elevation is the distance above the reference geoid, a mathematical model of the Earths sea level as an equipotential gravitational surface. The topographic prominence of a summit is the difference between that summit and the highest or key col to a higher summit. The topographic isolation of a summit is the minimum distance to a point of equal elevation. This article defines a significant summit as a summit with at least 100 meters of prominence. An ultra-prominent summit is a summit with at least 1500 meters of topographic prominence, there are 126 ultra-prominent summits in the United States. All elevations include an adjustment from the National Geodetic Vertical Datum of 1929 to the North American Vertical Datum of 1988, for further information, please see this United States National Geodetic Survey note
List of highest mountain peaks of California
–
1.
Mount Whitney is the highest summit of the
Sierra Nevada, the
State of California, and the
contiguous United States.
List of highest mountain peaks of California
–
2.
Mount Williamson is the second highest mountain peak of
California.
List of highest mountain peaks of California
–
3.
White Mountain Peak is the highest summit of the
White Mountains.
List of highest mountain peaks of California
–
4.
North Palisade is the highest summit of the
Palisades of the
Sierra Nevada.
8.
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.
9.
Siskiyou County, California
–
Siskiyou County /ˈsɪskjuː/ SISS-kew is a county in the northernmost part of the U. S. state of California. As of the 2010 census, the population was 44,900, Siskiyou County is in the Shasta Cascade region along the Oregon border. Because of its outdoor recreation opportunities and Gold Rush era history, Siskiyou County was created on March 22,1852, from parts of Shasta and Klamath Counties, and named after the Siskiyou mountain range. Parts of the territory were given to Modoc County in 1855. The county is the site of the section of the Siskiyou Trail. The Siskiyou Trail followed Native American footpaths, and was extended by Hudsons Bay Company trappers in the 1830s and its length was increased by Forty-Niners during the California Gold Rush. After the discovery of an important gold strike near today’s Yreka, California in 1851 and this was described in detail by Joaquin Miller in his semi-autobiographical novel Life Amongst the Modocs. In the mid 1880s, the construction of the Central Pacific Railroad along the Siskiyou Trail brought the a first wave of tourism, Visitors were drawn by the county’s many summer resorts, and to hunt or fish in the largely untouched region. The Southern Pacific railroad, the successor to the Central Pacific, the movement has seen a revival in recent years. The origin of the word Siskiyou is not known, others claim the Six Cailloux name was appropriated by Stephen Meek, another Hudsons Bay Company trapper who discovered Scott Valley, for a crossing on the Klamath River near Hornbrook. The County is home to the Black Bear Ranch, a commune started in 1968 with the slogan Free Land for free people, on September 4,2013, the Siskiyou County Board of Supervisors voted 4 to 1 to secede from the State of California. According to the U. S. Census Bureau, the county has an area of 6,347 square miles. It is the fifth-largest county by area in California, the county is dotted as well with lakes and reservoirs, such as Castle Lake and Lake Siskiyou. Mount Shasta itself has a sports center. Pastoral Scott Valley in the part of the county has many wide, tree-lined meadows. Butte Valley nurseries are the source of premium strawberry plants in North America. The county’s water is viewed as pure and abundant that the county is a source of significant amounts of bottled water. A large Crystal Geyser plant is at the base of Mt. Shasta, substantial amounts of the county are forested within the Siskiyou and Cascade Ranges, including significant oak woodland and mixed conifer forests
Siskiyou County, California
Siskiyou County, California
Siskiyou County, California
Siskiyou County, California
–
Seal
10.
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
11.
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
12.
Mountain range
–
A mountain range is a geographic area containing numerous geologically related mountains. A mountain system or system of ranges, sometimes is used to combine several geological features that are geographically related. Mountain ranges are usually segmented by highlands or mountain passes and valleys, individual mountains within the same mountain range do not necessarily have the same geologic structure or petrology. They may be a mix of different orogenic expressions and terranes, for example thrust sheets, uplifted blocks, fold mountains, most geologically young mountain ranges on the Earths land surface are associated with either the Pacific Ring of Fire or the Alpide Belt. The Andes is 7,000 kilometres long and is considered the worlds longest mountain system. The Alpide belt includes Indonesia and southeast Asia, through the Himalaya, the belt also includes other European and Asian mountain ranges. The Himalayas contain the highest mountains in the world, including Mount Everest, mountain ranges outside of these two systems include the Arctic Cordillera, the Urals, the Appalachians, the Scandinavian Mountains, the Altai Mountains and the Hijaz Mountains. If the definition of a range is stretched to include underwater mountains. The mountain systems of the earth are characterized by a tree structure, the sub-range relationship is often expressed as a parent-child relationship. For example, the White Mountains of New Hampshire and the Blue Ridge Mountains are sub-ranges of the Appalachian Mountains, equivalently, the Appalachians are the parent of the White Mountains and Blue Ridge Mountains, and the White Mountains and the Blue Ridge Mountains are children of the Appalachians. The position of mountains influences climate, such as rain or snow, when air masses move up and over mountains, the air cools producing orographic precipitation. As the air descends on the side, it warms again and is drier. Often, a shadow will affect the leeward side of a range. Mountain ranges are constantly subjected to forces which work to tear them down. Erosion is at work while the mountains are being uplifted and long after until the mountains are reduced to low hills, rivers are traditionally believed to be the principle erosive factor on mountain ranges, with their ability of bedrock incision and sediment transport. The rugged topography of a range is the product of erosion. The basins adjacent to a mountain range are filled with sediments which are buried and turned into sedimentary rock. The early Cenozoic uplift of the Rocky Mountains of Colorado provides an example and this mass of rock was removed as the range was actively undergoing uplift
Mountain range
–
The
Himalayas, the highest mountain range on Earth, seen from space
Mountain range
–
Mountain range of
High Tatras in
Slovakia in 1865
Mountain range
–
The
Andes, the world's longest mountain range on the surface of a continent, seen from the air
Mountain range
–
Hillary and Norgay Montes on Pluto (14 July 2015)
13.
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
14.
Topographic map
–
Traditional definitions require a topographic map to show both natural and man-made features. A topographic map is published as a map series, made up of two or more map sheets that combine to form the whole map. A contour line is a line connecting places of equal elevation, however, in the vernacular and day to day world, the representation of relief is popularly held to define the genre, such that even small-scale maps showing relief are commonly called topographic. The study or discipline of topography is a broader field of study. Topographic maps are based on topographical surveys, performed at large scales, these surveys are called topographical in the old sense of topography, showing a variety of elevations and landforms. This is in contrast to older cadastral surveys, which primarily show property, the first multi-sheet topographic map series of an entire country, the Carte géométrique de la France, was completed in 1789. Topographic surveys were prepared by the military to assist in planning for battle, as such, elevation information was of vital importance. As they evolved, topographic map series became a resource in modern nations in planning infrastructure. Excluding borders, each sheet was 44 cm high and up to 66 cm wide, although the project eventually foundered, it left an indexing system that remains in use. TIGER was developed in the 1980s and used in the 1990, digital elevation models were also compiled, initially from topographic maps and stereographic interpretation of aerial photographs and then from satellite photography and radar data. Since all these were government projects funded with taxes and not classified for security reasons. Initial applications were mostly professionalized forms such as innovative surveying instruments, by the mid-1990s, increasingly user-friendly resources such as online mapping in two and three dimensions, integration of GPS with mobile phones and automotive navigation systems appeared. As of 2011, the future of standardized, centrally printed topographical maps is left somewhat in doubt, the various features shown on the map are represented by conventional signs or symbols. For example, colors can be used to indicate a classification of roads and these signs are usually explained in the margin of the map, or on a separately published characteristic sheet. Topographic maps are commonly called contour maps or topo maps. In the United States, where the national series is organized by a strict 7. 5-minute grid. Topographic maps conventionally show topography, or land contours, by means of contour lines, contour lines are curves that connect contiguous points of the same altitude. In other words, every point on the line of 100 m elevation is 100 m above mean sea level
Topographic map
–
Part of the same map in a perspective
shaded relief view illustrating how the contour lines follow the terrain
Topographic map
–
A topographic map with contour lines
Topographic map
–
Section of topographical map of
Nablus area (
West Bank) with contour lines at 100-meter intervals. Heights are colour-coded
Topographic map
–
Curvimeter used to measure the length of a curve
15.
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
16.
Geologic time scale
–
The table of geologic time spans, presented here, agrees with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy. Evidence from radiometric dating indicates that Earth is about 4.54 billion years old, the geology or deep time of Earth’s past has been organized into various units according to events which took place in each period. Older time spans, which predate the reliable record, are defined by their absolute age. Some other planets and moons within the Solar System have sufficiently rigid structures to have preserved records of their own histories, for example, Venus, Mars, dominantly fluid planets, such as the gas giants, do not preserve their history in a comparable manner. Apart from the Late Heavy Bombardment, events on other planets probably had little influence on the Earth. Construction of a scale that links the planets is, therefore, of only limited relevance to the Earths time scale. The existence, timing, and terrestrial effects of the Late Heavy Bombardment is still debated, the largest defined unit of time is the supereon, composed of eons. Eons are divided into eras, which are in turn divided into periods, epochs, the terms eonothem, erathem, system, series, and stage are used to refer to the layers of rock that correspond to these periods of geologic time in Earths history. Geologists qualify these units as early, mid, and late when referring to time, and lower, middle, for example, the lower Jurassic Series in chronostratigraphy corresponds to the early Jurassic Epoch in geochronology. The adjectives are capitalized when the subdivision is formally recognized, and lower case when not, thus early Miocene but Early Jurassic. Geologic units from the time but different parts of the world often look different and contain different fossils. For example, in North America the Lower Cambrian is called the Waucoban series that is subdivided into zones based on succession of trilobites. In East Asia and Siberia, the unit is split into Alexian, Atdabanian. A key aspect of the work of the International Commission on Stratigraphy is to reconcile this conflicting terminology, the term Anthropocene is used informally by popular culture and a growing number of scientists to describe the current epoch in which we are living. The term was coined by Paul Crutzen and Eugene Stoermer in 2000 to describe the current time, others say that humans have not even started to leave their biggest impact on Earth, and therefore the Anthropocene hasnt even started yet. Whatever the case, the ICS has not officially approved the term, leonardo da Vinci concurred with Aristotles interpretation that fossils represented the remains of ancient life. The 11th-century Persian geologist Avicenna and the 13th-century Dominican bishop Albertus Magnus extended Aristotles explanation into a theory of a petrifying fluid. Avicenna also first proposed one of the principles underlying geologic time scales, the Chinese naturalist Shen Kuo also recognized the concept of deep time
Geologic time scale
–
Key concepts
Geologic time scale
17.
Stratovolcano
–
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a profile and periodic explosive eruptions and effusive eruptions. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity, the magma forming this lava is often felsic, having high-to-intermediate levels of silica, with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as 15 km, stratovolcanoes are sometimes called composite volcanoes because of their composite layered structure built up from sequential outpourings of eruptive materials. They are among the most common types of volcanoes, in contrast to the less common shield volcanoes, two famous stratovolcanoes are Krakatoa, best known for its catastrophic eruption in 1883 and Vesuvius, famous for its destruction of the towns Pompeii and Herculaneum in 79 CE. Both eruptions claimed thousands of lives, in modern times, Mount Saint Helens and Mount Pinatubo have erupted catastrophically. Existence of stratovolcanoes has not been proved on other bodies of the solar system with one exception. Their existence was suggested for some isolated massifs on Mars, e. g. Zephyria Tholus, stratovolcanoes are common at subduction zones, forming chains along plate tectonic boundaries where oceanic crust is drawn under continental crust or another oceanic plate. The release of water from hydrated minerals is termed dewatering, and occurs at pressures and temperatures for each mineral. The magma then rises through the crust, incorporating silica-rich crustal rock, when the magma nears the top surface, it pools in a magma chamber under or within the volcano. There, the low pressure allows water and other volatiles dissolved in the magma to escape from solution, as occurs when a bottle of carbonated water is opened. Once a critical volume of magma and gas accumulates, the obstacle of the cone is overcome. In recorded history, explosive eruptions at subduction zone volcanoes have posed the greatest hazard to civilizations. Subduction-zone stratovolcanoes, such as Mount St. Helens, Mount Etna and Mount Pinatubo, typically erupt with explosive force, as a consequence, the tremendous internal pressures of the trapped volcanic gases remain in the pasty magma. Following the breaching of the chamber, the magma degasses explosively. The gases and water out with speed and force. Since 1600 CE, nearly 300,000 people have killed by volcanic eruptions. Most deaths were caused by flows and mudflows, deadly hazards that often accompany explosive eruptions of subduction-zone stratovolcanoes
Stratovolcano
–
Mount Vesuvius near Naples, Italy, erupted in AD 79. The last eruption of this stratovolcano occurred in March 1944. It has been essentially dormant since then.
Stratovolcano
–
Mount Etna on the Island of
Sicily
Stratovolcano
–
Mount Unzen in southwestern Japan
Stratovolcano
–
Mayon Volcano erupted on December 29, 2009, producing lava flows.
18.
Volcanic arc
–
A volcanic arc is a chain of volcanoes formed above a subducting plate, positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in an island arc. Generally, volcanic arcs result from the subduction of a tectonic plate under another tectonic plate. The oceanic plate is saturated with water, and volatiles such as water drastically lower the point of the mantle. As the oceanic plate is subducted, it is subjected to greater and greater pressures with increasing depth and this pressure squeezes water out of the plate and introduces it to the mantle. Here the mantle melts and forms magma at depth under the overriding plate, the magma ascends to form an arc of volcanoes parallel to the subduction zone. The Hawaiian Islands form a typical hotspot chain, the islands to the northwest are smaller and more lush than the recently created Hawaii island itself. Hotspot volcanoes are known as intra-plate volcanoes, and the islands they create are known as Volcanic Ocean Islands. Volcanic arcs do not generally such a simple age-pattern. There are two types of volcanic arcs, oceanic arcs form when oceanic crust subducts beneath other oceanic crust on an adjacent plate, continental arcs form when oceanic crust subducts beneath continental crust on an adjacent plate, creating an arc-shaped mountain belt. In some situations, a subduction zone may show both aspects along its length, as part of a plate subducts beneath a continent and part beneath adjacent oceanic crust. Volcanoes are present in almost any mountain belt, but this does not make it a volcanic arc, often there are isolated, but impressively huge volcanoes in a mountain belt. For instance, Vesuvius and the Etna volcanoes in Italy are part of separate, the active front of a volcanic arc is the belt where volcanism develops at a given time. Active fronts may move over time, changing their distance from the trench as well as their width. This loss of water is due to the destabilization of the mineral chlorite at approximately 40–60 km depth. On the subducting side of the arc is a deep and narrow oceanic trench. This trench is created by the pull of the relatively dense subducting plate pulling the leading edge of the plate downward. Multiple earthquakes occur along this boundary with the seismic hypocenters located at increasing depth under the island arc
Volcanic arc
–
Mariana Islands, an oceanic island arc
Volcanic arc
–
The Aleutian Arc, with both oceanic and continental parts.
Volcanic arc
–
Landforms
19.
Cascade Volcanoes
–
This article is for the volcanic arc. For the namesake mountain range see Cascade Range, the arc has formed due to subduction along the Cascadia subduction zone. Some of the cities along the length of the arc include Portland, Seattle, and Vancouver. All could be affected by volcanic activity and great subduction-zone earthquakes along the arc. Many large, long-runout landslides originating on Cascade volcanoes have inundated valleys tens of kilometers from their sources, the Cascade Volcanoes are part of the Pacific Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean. The Cascade Volcanoes have erupted several times in recorded history, two most recent were Lassen Peak in 1914 to 1921 and a major eruption of Mount St. Helens in 1980. It is also the site of Canadas most recent major eruption about 2,350 years ago at the Mount Meager volcanic complex. Volcanism in the arc began about 37 million years ago, however, most of the present-day Cascade volcanoes are less than 2,000,000 years old, and the highest peaks are less than 100,000 years old. Twelve volcanoes in the arc are over 10,000 feet in elevation, by volume, the two largest Cascade volcanoes are the broad shields of Medicine Lake Volcano and Newberry Volcano, which are about 145 cubic miles and 108 cubic miles respectively. Mount Garibaldi and Glacier Peak are the only two Cascade volcanoes that are exclusively of dacite. Over the last 37 million years, the Cascade Arc has been erupting a chain of volcanoes along the Pacific Northwest, several of the volcanoes in the arc are frequently active. The volcanoes of the Cascade Arc share some characteristics, but each has its own unique geological traits. The Cascade Volcanic Arc appears to be segmented, the portion of the arc is the most active. The greatest mass of exposed Cascade Arc plumbing is the Chilliwack batholith, individual plutons range in age from about 35 million years old to 2.5 million years old. The older rocks invaded by all this magma were affected by the heat, around the plutons of the batholith, the older rocks recrystallized. This contact metamorphism produced a fine mesh of interlocking crystals in the old rocks, generally strengthening them, where the recrystallization was intense, the rocks took on a new appearance dark, dense and hard. Many rugged peaks in the North Cascades owe their prominence to this baking, the Garibaldi Volcanic Belt is the northern extension of the Cascade Arc. Volcanoes within the belt are mostly stratovolcanoes along with the rest of the arc, but also include calderas, cinder cones
Cascade Volcanoes
–
Mount Rainier from the northeast
Cascade Volcanoes
Cascade Volcanoes
–
Lassen Peak and
Devastated Area from
Cinder Cone
Cascade Volcanoes
–
Mount Garibaldi as seen from
Squamish
20.
Types of volcanic eruptions
–
Several types of volcanic eruptions—during which lava, tephra, and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed, some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. There are three different types of eruptions, the most well-observed are magmatic eruptions, which involve the decompression of gas within magma that propels it forward. Phreatomagmatic eruptions are another type of eruption, driven by the compression of gas within magma. Within these wide-defining eruptive types are several subtypes, the weakest are Hawaiian and submarine, then Strombolian, followed by Vulcanian and Surtseyan. The stronger eruptive types are Pelean eruptions, followed by Plinian eruptions, subglacial and phreatic eruptions are defined by their eruptive mechanism, and vary in strength. An important measure of strength is Volcanic Explosivity Index, an order of magnitude scale ranging from 0 to 8 that often correlates to eruptive types. Explosive eruptions are characterized by gas-driven explosions that propels magma and tephra, effusive eruptions, meanwhile, are characterized by the outpouring of lava without significant explosive eruption. Volcanic eruptions vary widely in strength, on the one extreme there are effusive Hawaiian eruptions, which are characterized by lava fountains and fluid lava flows, which are typically not very dangerous. On the other extreme, Plinian eruptions are large, violent, volcanoes are not bound to one eruptive style, and frequently display many different types, both passive and explosive, even the span of a single eruptive cycle. Volcanoes do not always erupt vertically from a crater near their peak. Some volcanoes exhibit lateral and fissure eruptions, notably, many Hawaiian eruptions start from rift zones, and some of the strongest Surtseyan eruptions develop along fracture zones. Scientists believed that pulses of magma mixed together in the chamber before climbing upward—a process estimated to several thousands of years. But Columbia University volcanologists found that the eruption of Costa Rica’s Irazú Volcano in 1963 was likely triggered by magma that took a route from the mantle over just a few months. The volcanic explosivity index is a scale, from 0 to 8 and it is used by the Smithsonian Institutions Global Volcanism Program in assessing the impact of historic and prehistoric lava flows. It operates in a way similar to the Richter scale for earthquakes, the vast majority of volcanic eruptions are of VEIs between 0 and 2. Volcanic eruptions by VEI index Magmatic eruptions produce juvenile clasts during explosive decompression from gas release, Hawaiian eruptions are a type of volcanic eruption, named after the Hawaiian volcanoes with which this eruptive type is hallmark. Hawaiian eruptions are the calmest types of events, characterized by the effusive eruption of very fluid basalt-type lavas with low gaseous content
Types of volcanic eruptions
–
Some of the eruptive structures formed during volcanic activity: a
Plinian eruption column,
Hawaiian pahoehoe flows, and a lava arc from a
Strombolian eruption.
Types of volcanic eruptions
–
Ropey
pahoehoe lava from
Kilauea,
Hawaiʻi.
Types of volcanic eruptions
–
An example of the lava arcs formed during Strombolian activity. This image is of
Stromboli itself.
Types of volcanic eruptions
–
Tavurvur in
Papua New Guinea erupting.
21.
First ascent
–
In climbing, a first ascent is the first successful, documented attainment of the top of a mountain, or the first to follow a particular climbing route. First ascents are notable because they entail genuine exploration, with risks, challenges. The person who performs the first ascent is called the first ascensionist, the details of the first ascents of even many prominent mountains are scanty or unknown, sometimes the only evidence of prior summiting is a cairn, artifacts, or inscriptions at the top. Today, first ascents are generally recorded and usually mentioned in guidebooks. Overwhelmingly, the idea of a first ascent is a one, especially in places such as Africa. There may be little or no evidence or documentation about the climbing activities of indigenous peoples living near the mountain. The term is used when referring to ascents made using a specific technique or taking a specific route, such as via the North Face. In rock climbing, some of the earlier first ascents, particularly for difficult routes, involved a mix of free, as a result, purist free climbers have developed the designation first free ascent to acknowledge ascents intentionally made more challenging by using equipment for protection only. Some other first ascents could be recorded for particular mountains or routes, one is the First Winter Ascent, which is, as the name easily suggests, the first ascent made during winter season. This is most important where the climate of winter is a factor in increasing the difficulty grade of the route, in the Northern Hemisphere conventional winter ascents are made between December 21 and March 21 and are not related to the conditions. Also in the Himalayan area, although Nepal and Chinas winter season permits start on December 1, another is the First Solo Ascent, which is the first ascent made by a single climber. This is most important on high-level rock climbing, when the climber has to provide his own security or even when climbing without any protection at all, another type of ascent, also known as FFA is the first female ascent. The term last ascent has been used to refer to an ascent of a mountain or face that has changed to such an extent – often because of rockfall – that the route no longer exists. It can also be used facetiously to refer to a climb that is so unpleasant or unaesthetic that no one would willingly repeat the first ascent partys ordeal. List of first ascents List of first ascents in the Alps List of first ascents in the Himalaya Glossary of climbing terms Alpinist Magazine – Peter Mortimers First Ascent, Issue 17
First ascent
–
Henry Barber on first ascent of Savage Journey at Lost World,
Mt. Wellington,
Tasmania, 1975
22.
Scree
–
Scree is a collection of broken rock fragments at the base of crags, mountain cliffs, volcanoes or valley shoulders that has accumulated through periodic rockfall from adjacent cliff faces. Landforms associated with these materials are called talus deposits. Talus deposits typically have a concave form, while the maximum inclination corresponds to the angle of repose of the mean debris size. The term scree comes from the Old Norse term for landslide, skriða, formation of scree or talus deposits the results of physical and chemical weathering and erosion acting on a rock face. During the day, water can flow into joints and discontinuities in the rock wall, if the temperature drops enough, for example in the evening, this water may freeze. Since water expands by 9% when it freezes, it can generate forces that either create new cracks or wedge blocks into an unstable position. Special boundary conditions may be required for this to happen, the efficiency of freeze/thaw processes in scree production is debated by scientists. Many researchers believe that ice formation in large open crack systems cannot generate high pressures, many argue that frost heaving, like that known to act in soil in permafrost areas, may play an important role in cliff degradation in cold places. For example, Lech dl Dragon, in the Sella Group of the Dolomites, derives from the waters of a glacier. The melting process of the glacier is slowed by the protective layer of scree. Eventually a rock slope may be covered by its own scree. The slope is then said to be mantled with debris, fellfield Lava stringer Mass wasting Weathering
Scree
–
Talus at the bottom of
Mount Yamnuska,
Alberta,
Canada.
Scree
–
Climber on talus slope on the west flank of
Cross Fell,
England.
Scree
–
Talus cones on north shore of
Isfjord,
Svalbard,
Norway.
Scree
–
The lake
Lech dl Dragon in the
Dolomites,
Italy.
23.
National Natural Landmark
–
The National Natural Landmarks Program recognizes and encourages the conservation of outstanding examples of the natural history of the United States. It is the only national natural areas program that identifies and recognizes the best examples of biological and geological features in both public and private ownership, the program was established on May 18,1962, by United States Secretary of the Interior Stewart Udall. The program aims to encourage and support voluntary preservation of sites that illustrate the geological and ecological history of the United States and it also hopes to strengthen the publics appreciation of the countrys natural heritage. As of November 2016,599 sites have been added to the National Registry of National Landmarks, the registry includes nationally significant geological and ecological features in 48 states, American Samoa, Guam, Puerto Rico, and the Virgin Islands. The National Park Service administers the NNL Program and if requested, land acquisition by the federal government is not a goal of this program. National Natural Landmarks are nationally significant sites owned by a variety of land stewards, the legislative authority for the National Natural Landmarks Program stems from the Historic Sites Act of August 21,1935, the program is governed by federal regulations. The NNL Program does not have the features of Section 106 of the National Historic Preservation Act of 1966. Thus, designation of a National Natural Landmark presently constitutes only an agreement with the owner to preserve, insofar as possible, administration and preservation of National Natural Landmarks is solely the owners responsibility. Either party may terminate the agreement after they notify the other, the UKs Site of Special Scientific Interest list is a rough equivalent. The NNL designation is made by the Secretary of the Interior after in-depth scientific study of a potential site, all new designations must have owner concurrence. The selection process is rigorous, to be considered for NNL status, since establishment of the NNL program, a multi-step process has been used to designate a site for NNL status. Since 1970, the steps have constituted the process. A natural area inventory of a region is completed to identify the most promising sites. After landowners are notified that the site is being considered for NNL status, the evaluation report is peer reviewed by other experts to assure its soundness. The report is reviewed further by National Park Service staff, the site is reviewed by the Secretary of the Interiors National Park Advisory Board to determine that the site qualifies as an NNL. The findings are provided to the Secretary of the Interior who approves or declines, landowners are notified a third time informing them that the site has been designated an NNL. Each major natural history theme can be subdivided into various sub-themes. The NNL program does not require designated properties to be owned by public entities, lands under almost all forms of ownership or administration have been designated—federal, state, local, municipal and private
National Natural Landmark
–
The
Trona Pinnacles with National Natural Landmark sign
National Natural Landmark
–
Shiprock National Natural Landmark
National Natural Landmark
National Natural Landmark
24.
Karuk language
–
Karuk or Karok is an endangered language of northwestern California. It is the language of the Karuk people, most of whom now speak English. The name is derived from the word Káruk, which means upriver, linguist William Bright documented the Karuk language and produced a grammar of it in 1957. When Bright began his studies in 1949 there were a couple of hundred fluent speakers, a standardized system for writing the languages was adopted in the 1980s. Karuk is an isolate, sharing few if any similarities with other nearby languages. Historically, the American linguist Edward Sapir proposed it be classified as part of the Hokan family he hypothesized although little evidence supports this proposal, Karuk is a polysynthetic language known for its method of arranging old and new information. Skilled Karuk speakers use words to communicate new, salient detail, or to underscore known detail. Karuk Dictionary Online Karuk dictionary hosted by UC Berkeley Linguistics, cultures of the north Pacific coast. Center for Indian Community Development, Humboldt State University, OLAC resources in and about the Karok language
Karuk language
–
Karuk
25.
Volcano
–
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earths volcanoes occur because its crust is broken into 17 major, therefore, on Earth, volcanoes are generally found where tectonic plates are diverging or converging. This type of volcanism falls under the umbrella of plate hypothesis volcanism, Volcanism away from plate boundaries has also been explained as mantle plumes. These so-called hotspots, for example Hawaii, are postulated to arise from upwelling diapirs with magma from the boundary,3,000 km deep in the Earth. Volcanoes are usually not created where two plates slide past one another. Erupting volcanoes can pose hazards, not only in the immediate vicinity of the eruption. Historically, so-called volcanic winters have caused catastrophic famines, the word volcano is derived from the name of Vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn comes from Vulcan, the god of fire in Roman mythology. The study of volcanoes is called volcanology, sometimes spelled vulcanology, at the mid-oceanic ridges, two tectonic plates diverge from one another as new oceanic crust is formed by the cooling and solidifying of hot molten rock. Most divergent plate boundaries are at the bottom of the oceans, therefore, most volcanic activity is submarine, black smokers are evidence of this kind of volcanic activity. Where the mid-oceanic ridge is above sea-level, volcanic islands are formed, for example, subduction zones are places where two plates, usually an oceanic plate and a continental plate, collide. In this case, the plate subducts, or submerges under the continental plate forming a deep ocean trench just offshore. In a process called flux melting, water released from the subducting plate lowers the temperature of the overlying mantle wedge. This magma tends to be very viscous due to its high content, so it often does not reach the surface. When it does reach the surface, a volcano is formed, typical examples of this kind of volcano are Mount Etna and the volcanoes in the Pacific Ring of Fire. Because tectonic plates move across them, each volcano becomes dormant and is eventually re-formed as the plate advances over the postulated plume and this theory is currently under criticism, however. The most common perception of a volcano is of a mountain, spewing lava and poisonous gases from a crater at its summit, however. The features of volcanoes are more complicated and their structure. Some volcanoes have rugged peaks formed by lava domes rather than a summit crater while others have features such as massive plateaus
Volcano
–
Cleveland Volcano in the
Aleutian Islands of
Alaska photographed from the
International Space Station, May 2006
Volcano
–
Ash plumes reached a height of 19 kilometres (12 mi) during the climactic
explosive eruption at
Mount Pinatubo, Philippines in 1991.
Volcano
–
A 2007 eruptive column at
Mount Etna producing volcanic ash, pumice and lava bombs
Volcano
–
Ubinas Volcano
26.
U.S. state
–
A U. S. state is a constituent political entity of the United States of America. There are 50 states, which are together in a union with each other. Each state holds administrative jurisdiction over a geographic territory. Due to the shared sovereignty between each state and the government, Americans are citizens of both the federal republic and of the state in which they reside. State citizenship and residency are flexible, and no government approval is required to move between states, except for persons covered by certain types of court orders. States range in population from just under 600,000 to over 39 million, four states use the term commonwealth rather than state in their full official names. States are divided into counties or county-equivalents, which may be assigned some local authority but are not sovereign. County or county-equivalent structure varies widely by state, State governments are allocated power by the people through their individual constitutions. All are grounded in principles, and each provides for a government. States possess a number of powers and rights under the United States Constitution, Constitution has been amended, and the interpretation and application of its provisions have changed. The general tendency has been toward centralization and incorporation, with the government playing a much larger role than it once did. There is a debate over states rights, which concerns the extent and nature of the states powers and sovereignty in relation to the federal government. States and their residents are represented in the federal Congress, a legislature consisting of the Senate. Each state is represented in the Senate by two senators, and is guaranteed at least one Representative in the House, members of the House are elected from single-member districts. Representatives are distributed among the states in proportion to the most recent constitutionally mandated decennial census, the Constitution grants to Congress the authority to admit new states into the Union. Since the establishment of the United States in 1776, the number of states has expanded from the original 13 to 50, alaska and Hawaii are the most recent states admitted, both in 1959. The Constitution is silent on the question of states have the power to secede from the Union. Shortly after the Civil War, the U. S. Supreme Court, in Texas v. White, as a result, while the governments of the various states share many similar features, they often vary greatly with regard to form and substance
U.S. state
–
U.S. states
27.
Shastina
–
Shastina is the highest satellite cone of Mount Shasta, and one of four overlapping volcanic cones which together form the most voluminous stratovolcano in the Cascade Range. The name Shastina is a diminutive of Shasta, the most prominent feature when seen from lowland viewpoints is Diller Canyon, a large cleft carved into the western flank by pyroclastic flows and since expanded by erosion. Unseen except by mountaineers and fliers are the three small lakes nestled among the cones and ridges of the summit crater, which rarely melt free of snow until late summer. Clarence King Lake at 11,755 ft occupies the center of the crater, highest of all is an unnamed lake at over 11,960 ft on the south side of the cinder cone which forms Shastinas true summit. These lakes are the highest subaerial lakes in the entire Cascade Range, for most mountaineers, it represents only a quick side trip on the way back from the main objective of climbing Shasta
Shastina
–
Shasta from the west, taken on
Lake Siskiyou, just west of Mount Shasta City. Shastina is the satellite cone on the left.
Shastina
–
British Columbia
28.
Central Valley (California)
–
Californias Central Valley is a large, flat valley that dominates the geographical center of the U. S. state of California. It is 40 to 60 miles wide and stretches approximately 450 miles from north-northwest to south-southeast, inland from and it covers approximately 18,000 square miles, about 11% of Californias total land area. More than 7 million acres of the valley are irrigated via a system of reservoirs. The valley also has many cities, including the state capital Sacramento, as well as Redding, Stockton, Modesto, Fresno. The Central Valley watershed comprises 60,000 square miles, or over a third of California, the delta empties into the San Francisco Bay, and then ultimately flows into the Pacific. The Central Valley is commonly known to simply as the Valley. Older names include the Great Valley, a name often seen in scientific references, and Golden Empire. The Central Valley is outlined by the Cascade, Sierra Nevada, and Tehachapi mountain ranges on the east, the broad valley floor is carpeted by vast agricultural regions, and dotted with numerous population centers. While there are many large and small between these cities, these four cities act as hubs for regional commerce and transportation. About 6.5 million people live in the Central Valley today, there are 12 Metropolitan Statistical Areas and 1 Micropolitan Statistical Area in the Central Valley. Below, they are listed by MSA and μSA population, the largest city is Fresno, followed by the state capital, Sacramento. The valley is thought to have originated below sea level as an offshore area depressed by subduction of the Farallon Plate into a trench further offshore, the San Joaquin Fault is a notable seismic feature of the Central Valley. The valley was later enclosed by the uplift of the Coast Ranges, faulting moved the Coast Ranges, and a new outlet developed near what is now San Francisco Bay. The one notable exception to the valley floor is Sutter Buttes. Another significant geologic feature of the Central Valley lies hidden beneath the delta, the Stockton Arch is an upwarping of the crust beneath the valley sediments which extends southwest to northeast across the valley. However, much of the Central Valley environment has been removed or altered by human activity including the introduction of exotic plants, the oak woodlands and chaparral that fringe the valley have been categorized as the California interior chaparral and woodlands ecoregion. The wetlands have been the target of operations to restore areas nearly destroyed by agriculture. The dominant grass of the valley was Nassella pulchra mixed with other species, grassland flowers include California poppy, lupins, and purple owls clover which can still be seen, especially in Antelope Valley in the Tehachapi hills
Central Valley (California)
–
Topography, major parts and cities of the Central Valley
Central Valley (California)
–
Part of the Valley as seen from the air
Central Valley (California)
–
An example of the extreme differences between the geology of the valley floor and that of the rugged hills of the Coast Ranges (Between Tracy and Patterson, CA:Interstate 5)
Central Valley (California)
–
Central Valley seen from space.
29.
Satellite cone
–
A parasitic cone is the cone-shaped accumulation of volcanic material not part of the central vent of a volcano. It forms from eruptions from fractures on the flank of the volcano and these fractures occur because the flank of the volcano is unstable. Eventually, the reach the magma chamber and generate eruptions called flank eruptions. A parasitic cone can also be formed from a dike or sill cutting up to the surface from the magma chamber in an area different from the central vent. An example of parasitic cone is Mount Scott, which is the parasite of Mount Mazama in Crater Lake National Park, Oregon, a peculiar example of multiple parasitic cones is Jeju Island in South Korea. Jeju features 368 oreum, which lie in a lateral line on either side of the islands central dormant shield volcano Hallasan. Flank crater How Volcanoes Work, Volcano Types
Satellite cone
–
Parasitic cone (in foreground) with larger main cone in background, at
Piton de la Fournaise volcano on the island of
Réunion.
Satellite cone
–
Volcano types
30.
Mount Rainier
–
Mount Rainier, Mount Tacoma, or Mount Tahoma is the highest mountain of the Cascade Range of the Pacific Northwest, and the highest mountain in the U. S. state of Washington. It is an active stratovolcano located 54 miles south-southeast of Seattle. Because of its amount of glacial ice, Mt.7 million living in its metropolitan area. Mount Rainier was first known by the Native Americans as Talol, one hypothesis of the word origin is, in the Lushootseed language spoken by the Puyallup people. Another hypothesis is that Tacoma means larger than Mount Baker in Lushootseed, Ta, larger, plus Koma, other names originally used include Tahoma, Tacobeh, and Pooskaus. The current name was given by George Vancouver, who named it in honor of his friend, the map of the Lewis and Clark expedition of 1804-1806 refers to it as Mt. Regniere. Tacoma was preferred in the city of Tacoma, in 1890, the United States Board on Geographic Names declared that the mountain would be known as Rainier. Following this in 1897, the Pacific Forest Reserve became the Mount Rainier Forest Reserve, despite this, there was still a movement to change the mountains name to Tacoma and Congress was still considering a resolution to change the name as late as 1924. After the 2015 restoration of the original name Denali to Mount McKinley in Alaska, Mount Rainier is the highest mountain in Washington and the Cascade Range. This peak is located just east of Eatonville and just southeast of Seattle, Mount Rainier is ranked third of the 128 ultra-prominent mountain peaks of the United States. Mount Rainier has a prominence of 13,210 ft, which is greater than that of K2. On clear days it dominates the horizon in most of the Seattle-Tacoma metropolitan area to such an extent that locals sometimes refer to it simply as the Mountain. On days of exceptional clarity, it can also be seen from as far away as Corvallis, Oregon and Victoria, with 26 major glaciers and 36 sq mi of permanent snowfields and glaciers, Mount Rainier is the most heavily glaciated peak in the lower 48 states. The summit is topped by two volcanic craters, each more than 1,000 ft in diameter, with the larger east crater overlapping the west crater, the Carbon, Puyallup, Mowich, Nisqually, and Cowlitz Rivers begin at eponymous glaciers of Mount Rainier. The sources of the White River are Winthrop, Emmons, the broad top of Mount Rainier contains three named summits. The highest is called the Columbia Crest, the second highest summit is Point Success,14,158 ft, at the southern edge of the summit plateau, atop the ridge known as Success Cleaver. It has a prominence of about 138 ft, so it is not considered a separate peak. The lowest of the three summits is Liberty Cap,14,112 ft, at the edge, which overlooks Liberty Ridge, the Sunset Amphitheater
Mount Rainier
–
Mount Rainier as viewed from the northeast.
Mount Rainier
–
A panorama of the south face of Mount Rainier viewed from Westside Road, Washington State Route 706
Mount Rainier
–
One of many
emergency evacuation route signs in case of volcanic
eruption or
lahar around Mt. Rainier
31.
Liberty Cap (Washington)
–
Mount Rainier, Mount Tacoma, or Mount Tahoma is the highest mountain of the Cascade Range of the Pacific Northwest, and the highest mountain in the U. S. state of Washington. It is an active stratovolcano located 54 miles south-southeast of Seattle. Because of its amount of glacial ice, Mt.7 million living in its metropolitan area. Mount Rainier was first known by the Native Americans as Talol, one hypothesis of the word origin is, in the Lushootseed language spoken by the Puyallup people. Another hypothesis is that Tacoma means larger than Mount Baker in Lushootseed, Ta, larger, plus Koma, other names originally used include Tahoma, Tacobeh, and Pooskaus. The current name was given by George Vancouver, who named it in honor of his friend, the map of the Lewis and Clark expedition of 1804-1806 refers to it as Mt. Regniere. Tacoma was preferred in the city of Tacoma, in 1890, the United States Board on Geographic Names declared that the mountain would be known as Rainier. Following this in 1897, the Pacific Forest Reserve became the Mount Rainier Forest Reserve, despite this, there was still a movement to change the mountains name to Tacoma and Congress was still considering a resolution to change the name as late as 1924. After the 2015 restoration of the original name Denali to Mount McKinley in Alaska, Mount Rainier is the highest mountain in Washington and the Cascade Range. This peak is located just east of Eatonville and just southeast of Seattle, Mount Rainier is ranked third of the 128 ultra-prominent mountain peaks of the United States. Mount Rainier has a prominence of 13,210 ft, which is greater than that of K2. On clear days it dominates the horizon in most of the Seattle-Tacoma metropolitan area to such an extent that locals sometimes refer to it simply as the Mountain. On days of exceptional clarity, it can also be seen from as far away as Corvallis, Oregon and Victoria, with 26 major glaciers and 36 sq mi of permanent snowfields and glaciers, Mount Rainier is the most heavily glaciated peak in the lower 48 states. The summit is topped by two volcanic craters, each more than 1,000 ft in diameter, with the larger east crater overlapping the west crater, the Carbon, Puyallup, Mowich, Nisqually, and Cowlitz Rivers begin at eponymous glaciers of Mount Rainier. The sources of the White River are Winthrop, Emmons, the broad top of Mount Rainier contains three named summits. The highest is called the Columbia Crest, the second highest summit is Point Success,14,158 ft, at the southern edge of the summit plateau, atop the ridge known as Success Cleaver. It has a prominence of about 138 ft, so it is not considered a separate peak. The lowest of the three summits is Liberty Cap,14,112 ft, at the edge, which overlooks Liberty Ridge, the Sunset Amphitheater
Liberty Cap (Washington)
–
Mount Rainier as viewed from the northeast.
Liberty Cap (Washington)
–
A panorama of the south face of Mount Rainier viewed from Westside Road, Washington State Route 706
Liberty Cap (Washington)
–
One of many
emergency evacuation route signs in case of volcanic
eruption or
lahar around Mt. Rainier
32.
Erosion
–
In earth science, erosion is the action of surface processes that remove soil, rock, or dissolved material from one location on the Earths crust, then transport it away to another location. Eroded sediment or solutes may be transported just a few millimetres, the rates at which such processes act control how fast a surface is eroded. Feedbacks are also possible between rates of erosion and the amount of eroded material that is carried by, for example. Processes of erosion that produce sediment or solutes from a place contrast with those of deposition, while erosion is a natural process, human activities have increased by 10-40 times the rate at which erosion is occurring globally. At well-known agriculture sites such as the Appalachian Mountains, intensive farming practices have caused erosion up to 100x the speed of the rate of erosion in the region. Excessive erosion causes both on-site and off-site problems, on-site impacts include decreases in agricultural productivity and ecological collapse, both because of loss of the nutrient-rich upper soil layers. In some cases, the end result is desertification. Off-site effects include sedimentation of waterways and eutrophication of bodies, as well as sediment-related damage to roads. Intensive agriculture, deforestation, roads, anthropogenic climate change and urban sprawl are amongst the most significant human activities in regard to their effect on stimulating erosion, however, there are many prevention and remediation practices that can curtail or limit erosion of vulnerable soils. Rainfall, and the surface runoff which may result from rainfall, produces four types of soil erosion, splash erosion, sheet erosion, rill erosion. Splash erosion is generally seen as the first and least severe stage in the erosion process. In splash erosion, the impact of a falling raindrop creates a crater in the soil. The distance these soil particles travel can be as much as 0.6 m vertically and 1.5 m horizontally on level ground. If the soil is saturated, or if the rate is greater than the rate at which water can infiltrate into the soil. If the runoff has sufficient flow energy, it will transport loosened soil particles down the slope, sheet erosion is the transport of loosened soil particles by overland flow. Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes, generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimetres or less and this means that rills exhibit hydraulic physics very different from water flowing through the deeper, wider channels of streams and rivers. Gully erosion occurs when water accumulates and rapidly flows in narrow channels during or immediately after heavy rains or melting snow
Erosion
–
An actively eroding
rill on an
intensively-farmed field in
eastern Germany
Erosion
–
A
natural arch produced by the wind erosion of differentially weathered rock in Jebel Kharaz,
Jordan.
Erosion
–
A wave-like sea cliff produced by
coastal erosion, in Jinshitan Coastal National Geopark,
Dalian,
Liaoning Province,
China.
Erosion
–
Soil and water being
splashed by the impact of a single
raindrop.
33.
U-shaped valley
–
U-shaped valleys, or glacial troughs, are formed by the process of glaciation. They are characteristic of glaciation in particular. They have a characteristic U shape, with steep, straight sides, glaciated valleys are formed when a glacier travels across and down a slope, carving the valley by the action of scouring. When the ice recedes or thaws, the remains, often littered with small boulders that were transported within the ice. Examples of U-valleys are found in regions like the Alps, Himalaya, Rocky mountains, Scottish Highlands, Scandinavia, New Zealand. A classic glacial trough is in Glacier National Park in Montana, formation of a U-shaped valley happens over geologic time, meaning not during a human’s lifespan. It can take anywhere between 10,000 and 100,000 years for a V-shaped valley to be carved into a U-shaped valley and these valleys can be several thousand feet deep and tens of miles long. Glaciers will spread out evenly in open areas, but tend to carve deep into the ground when confined to a valley, ice thickness is a major contributing factor to valley depth and carving rates. As a glacier moves downhill through a valley, usually with a stream running through it, as the ice melts and retreats, the valley is left with very steep sides and a wide, flat floor. This parabolic shape is caused by glacial erosion striving to decrease friction as much as possible, there are two main variations of this U-shape. The first is called the Rocky Mountain model and it is attributed to alpine glacial valleys, the second variation is referred to as the Patagonia-Antarctica model, attributed to continental ice sheets and displaying an overall widening effect on its surroundings. The floors of these valleys is where the most evidence can be found regarding glaciation cycles. For the most part, the floor is wide and flat. The valley can have steps and over-deepenings anywhere from ten to hundreds of meters deep. These then fill in with water to create lakes, sometimes referred to as “string-of-pearl” or ribbon lakes, surrounding smaller tributary valleys will often join the main valleys during glaciation periods, leaving behind features known as hanging valleys high in the trough walls after the ice melts. After deglaciation, snow and ice melt from the tops can create streams. These are referred to a misfit streams, the streams that form in hanging valleys create waterfalls that flow into the main valley branch. The glacial valleys can also have natural dam-like structures cutting through them and they are created due to excess sediment and glacial till moved and deposited by the glacier
U-shaped valley
–
A glaciated valley in the
Altai Mountains showing the characteristic U shape.
U-shaped valley
–
U-shaped valley in
Leh valley,
Ladakh, NW Indian Himalaya. The glacier visible at the head of the valley is the last remnants of the formerly much more extensive valley glacier which carved this valley.
U-shaped valley
–
Illustration of a U-shaped valley being formed
U-shaped valley
–
U shaped Valley - Yosemite.
34.
Glacier
–
A glacier is a persistent body of dense ice that is constantly moving under its own weight, it forms where the accumulation of snow exceeds its ablation over many years, often centuries. Glaciers slowly deform and flow due to stresses induced by their weight, creating crevasses, seracs and they also abrade rock and debris from their substrate to create landforms such as cirques and moraines. Glaciers form only on land and are distinct from the much thinner sea ice, between 35°N and 35°S, glaciers occur only in the Himalayas, Andes, Rocky Mountains, a few high mountains in East Africa, Mexico, New Guinea and on Zard Kuh in Iran. Glaciers cover about 10 percent of Earths land surface, continental glaciers cover nearly 13,000,000 km2 or about 98 percent of Antarcticas 13,200,000 km2, with an average thickness of 2,100 m. Greenland and Patagonia also have huge expanses of continental glaciers, Glacial ice is the largest reservoir of fresh water on Earth. Within high altitude and Antarctic environments, the temperature difference is often not sufficient to release meltwater. A large piece of compressed ice, or a glacier, appears blue as large quantities of water appear blue and this is because water molecules absorb other colors more efficiently than blue. The other reason for the color of glaciers is the lack of air bubbles. Air bubbles, which give a color to ice, are squeezed out by pressure increasing the density of the created ice. The word Glaceon is a loanword from French and goes back, via Franco-Provençal, to the Vulgar Latin glaciārium, derived from the Late Latin glacia, the processes and features caused by or related to glaciers are referred to as glacial. The process of establishment, growth and flow is called glaciation. The corresponding area of study is called glaciology, Glaciers are important components of the global cryosphere. Glaciers are categorized by their morphology, thermal characteristics, and behavior, cirque glaciers form on the crests and slopes of mountains. A glacier that fills a valley is called a valley glacier, a large body of glacial ice astride a mountain, mountain range, or volcano is termed an ice cap or ice field. Ice caps have a less than 50,000 km2 by definition. Glacial bodies larger than 50,000 km2 are called ice sheets or continental glaciers, several kilometers deep, they obscure the underlying topography. Only nunataks protrude from their surfaces, the only extant ice sheets are the two that cover most of Antarctica and Greenland. They contain vast quantities of water, enough that if both melted, global sea levels would rise by over 70 m
Glacier
–
The
Baltoro Glacier in the
Karakoram,
Baltistan, Northern Pakistan. At 62 kilometres (39 mi) in length, it is one of the longest alpine glaciers on earth.
Glacier
–
Ice calving from the
terminus of the
Perito Moreno Glacier in western
Patagonia, Argentina
Glacier
–
The
Aletsch Glacier, the largest glacier of the
Alps, in Switzerland
Glacier
–
The
Quelccaya Ice Cap is the largest glaciated area in the
tropics, in Peru
35.
Whitney Glacier
–
The Whitney Glacier is a glacier situated on Mount Shasta, in the U. S. state of California. The Whitney Glacier is the longest glacier and the valley glacier in California. In area and volume, it ranks second in the state behind the nearby Hotlum Glacier, in 1986, the glacier was measured to be 126 ft deep and over three km in length. The glacier starts on Mount Shastas Misery Hill at 13,700 ft, in 2002, scientists made the first detailed survey of Mount Shastas glaciers in 50 years. The study concluded that there has been a two to three degree Celsius temperature rise in the region, there has also been a corresponding increase in the amount of snowfall. Increased temperatures have tapped Pacific Ocean moisture, leading to snowfalls that supply the accumulation zone of the glacier with 40 percent more snowfall than is melted in the ablation zone. Over the past 50 years, the glacier has actually expanded 30 percent, Whitney Glacier, along with the Hubbard Glacier in Alaska, are larger now than in 1890. However, Hubbard Glacier, along with a few other notable glaciers whose termini are at sea level, are calving glaciers, glaciologists often point out that glaciers are sensitive indicators of climate. This paradigm should not be applied to calving glaciers, during most of the calving glacier cycle, the slow advances and relatively rapid retreats are not very sensitive to climate. For example, the glaciers that are currently growing and advancing in the face of global warming, were retreating throughout the little ice age. No reasonable change in climate will change this imbalance and stop the advances of these few glaciers, Glaciers of California, Modern Glaciers, Ice Age Glaciers, the Origin of the Yosemite Valley, and a Glacier Tour in the Sierra Nevada
Whitney Glacier
–
Whitney Glacier
36.
Bolam Glacier
–
The Bolam Glacier is a glacier situated on the northern flank of Mount Shasta, in the U. S. state of California. It is the second longest glacier in California behind the nearby Whitney Glacier, and the fourth largest and most voluminous after the neighboring Hotlum Glacier, Whitney Glacier, and Wintun Glacier. The Bolam Glacier flows from a cirque on the side of Mount Shastas main summit. Above that, permanent snow and ice extends towards the summit to about 13,500 ft, the glacier flows north down a steep slope and terminates near 9,800 ft. In 2002, scientists made the first detailed survey of Mount Shastas glaciers in 50 years, list of glaciers in the United States
Bolam Glacier
–
Bolam Glacier
37.
Hotlum Glacier
–
The Hotlum Glacier is a glacier situated on the northeast flank of Mount Shasta, in the US state of California. It is the largest and most voluminous glacier in California, although not as thick or long as the nearby Whitney Glacier, the Hotlum Glacier flows from a large cirque on the northeast side of Mount Shastas main summit below the Hotlum Headwall at roughly 13,600 ft. It flows northeastward down the slope, forming three lobes which terminate near 10,400 ft. In 2002, scientists made the first detailed survey of Mount Shastas glaciers in 50 years, list of glaciers in the United States Existing Glaciers of Mount Shasta. Archived from the original on September 3,2006, Glaciers of California, Modern Glaciers, Ice Age Glaciers, the Origin of the Yosemite Valley, and a Glacier Tour in the Sierra Nevada
Hotlum Glacier
–
Hotlum Glacier
38.
Wintun Glacier
–
The Wintun Glacier is a glacier situated on the eastern flank of Mount Shasta, in the U. S. state of California. It is both the third largest and third most voluminous glacier in California after the neighboring Hotlum Glacier, the glacier flows east down a steep slope and terminates in two lobes, the longer of which extends down near 9,800 ft. In 2002, scientists made the first detailed survey of Mount Shastas glaciers in 50 years
Wintun Glacier
–
Wintun Glacier
39.
Cirque (landform)
–
A cirque is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie and cwm, a cirque may also be a similarly shaped landform arising from fluvial erosion. The concave shape of a glacial cirque is open on the downhill side, cliff-like slopes down which ice and glaciated debris combine and converge from the three or more higher sides. The fluvial cirque or makhtesh, found in karst landscapes, is formed by intermittent river flow cutting through layers of limestone, a common feature for all fluvial-erosion cirques is a terrain which includes erosion resistant upper structures overlying materials which are more easily eroded. Glacial cirques are found amongst mountain ranges throughout the world, classic cirques are typically about one kilometer long, situated high on a mountainside near the firn line, they are typically partially surrounded on three sides by steep cliffs. The highest cliff often is called a headwall, the fourth side forms the lip, threshold or sill, the side at which the glacier flowed away from the cirque. Many glacial cirques contain tarns dammed by either till or a bedrock threshold, when enough snow accumulates it can flow out the opening of the bowl and form valley glaciers which may be several kilometers long. These areas are sheltered from heat, encouraging the accumulation of snow, if the accumulation of snow increases, the process of nivation follows, whereby a hollow in a slope may be enlarged by ice segregation weathering and glacial erosion. Ice segregation erodes the rock vertical rock face and causes it to disintegrate, eventually, this hollow may become large enough that glacial erosion intensifies. The enlarging of this open ended concavity creates a larger leeward deposition zone, debris in the ice also may abrade the bed surface, should ice move down a slope it would have a ‘sandpaper effect’ on the bedrock beneath, on which it scrapes. Eventually, the hollow may become a bowl shape in the side of the mountain, with the headwall being weathered by ice segregation. The basin will become deeper as it continues to be eroded by ice segregation and abrasion, should ice segregation, plucking and abrasion continue, the dimensions of the cirque will increase, but the proportion of the landform would remain roughly the same. A bergschrund forms when the movement of the glacier separates the moving ice from the ice forming a crevasse. The method of erosion of the headwall lying between the surface of the glacier and the floor has been attributed to freeze-thaw mechanisms. The temperature within the bergschrund changes very little, however, studies have shown that ice segregation may happen with only changes in temperature. Water that flows into the bergschrund can be cooled to freezing temperatures by the ice allowing freeze-thaw mechanisms to occur. If two adjacent cirques erode toward one another, an arête, or steep sided ridge, forms, when three or more cirques erode toward one another, a pyramidal peak is created. In some cases, this peak will be accessible by one or more arêtes
Cirque (landform)
–
Two cirques with semi-permanent snowpatches near
Abisko National Park,
Sweden
Cirque (landform)
–
Upper Thornton Lake Cirque in
North Cascades National Park,
US
Cirque (landform)
–
The Lower Curtis Glacier in
North Cascades National Park is a well-developed
cirque glacier; if the glacier continues to retreat and melt away, a lake may form in the basin
Cirque (landform)
–
Lake Seal,
Mt. Field National Park,
Tasmania - a cirque formed from a glacier is visible in the walls around Lake Seal
40.
Watkins Glacier
–
The Watkins Glacier is a glacier situated on the southeastern flank of Mount Shasta, in the U. S. state of California. It occupies a cirque in the Clear Creek drainage. The Watkins is one of three small glaciers on the southern side of Shasta, along with the Konwakiton and Mud Creek Glaciers located about 1 mi west. It has the lowest average elevation of any of Shastas glaciers, in 2002, scientists made the first detailed survey of Mount Shastas glaciers in 50 years. List of glaciers Driedger, Carolyn L. Kennard, Paul M. Ice volumes on Cascade volcanoes, Mount Rainier, Mount Hood, Three Sisters, U. S. Geological Survey Professional Paper 1365. Archived from the original on 2007-07-15
Watkins Glacier
–
Watkins Glacier
41.
Konwakiton Glacier
–
The Konwakiton Glacier is a glacier situated on the southern flank of Mount Shasta, in the U. S. state of California. It occupies the head of a cirque on the south side of Shastas Misery Hill cone. It is the fifth largest glacier on Mount Shasta, although less than one-third the size of any of the four larger ones, in 2002, scientists made the first detailed survey of Mount Shastas glaciers in 50 years. List of glaciers in the United States Existing Glaciers of Mount Shasta, archived from the original on July 15,2007. Glaciers of California, Modern Glaciers, Ice Age Glaciers, the Origin of the Yosemite Valley, and a Glacier Tour in the Sierra Nevada
Konwakiton Glacier
–
Konwakiton Glacier
42.
Okwanuchu
–
The Okwanuchu were one of a number of small Shastan-speaking tribes of Native Americans in Northern California, who were closely related to the adjacent larger Shasta tribe. Anthropologist Alfred L. Kroeber suggested in 1918 that the Okwanuchu had become extinct, very little is known about the location of their villages and settlements, or about their culture, other than a presumed similarity to their Shasta and Achomawi neighbors. The archaeological sites associated with their range date back in excess of 5,000 years, the Okwanuchu were speakers of the Okwanuchu language, an older Hokan-speaking family of languages. Although their language was related to that of the Shasta language of the main Shasta tribe, it contained some elements of Wintu. It appears likely that even if Europeans and Americans not intervened, the Wintu would have absorbed or otherwise eliminated the Okwanuchu over the course of the coming centuries. Shastan languages Kroeber, A. L. “Handbook of the Indians of California. ”Native Tribes, Groups, Language Families and Dialects of California in 1770 Shasta territory, siskiyous. edu Shasta tribal history, Access Genealogy
Okwanuchu
–
Map representing the placement of the tribal lines suggested by
Alfred L. Kroeber onto a modern map.
43.
Modoc people
–
The Modoc are a Native American people who originally lived in the area which is now northeastern California and central Southern Oregon. They are currently divided between Oregon and Oklahoma and are enrolled in either of two federally recognized tribes, the Klamath Tribes in Oregon and the Modoc Tribe of Oklahoma, about 600 members of the tribe currently live in Klamath County, Oregon, in and around their ancestral homelands. Since that time, many have followed the path of the Klamath, the shared tribal government of the Klamath, Modoc and Yahooskin in Oregon is known as the Klamath Tribes. Two hundred Modoc live in Oklahoma on a reservation in Ottawa County, Oklahoma. Originally they were placed on the Quapaw Indian Reservation at the far northeast corner of Oklahoma and they are descendants of the band led by Captain Jack during the Modoc War. The Modoc Tribe of Oklahoma was officially recognized by the United States government in 1978, estimates for the pre-contact populations of most native groups in California have varied substantially. James Mooney put the population of the Modoc at 400. Alfred L. Kroeber estimated the Modoc population within California as 500 at the year 1770, university of Oregon anthropologist Theodore Stern suggested that there had been a total of about 500 Modoc. In 1846, the population may have included perhaps 600 warriors, prior to the 19th century, when European explorers first encountered the Modoc, like all Plateau Indians, they caught salmon during salmon runs and migrated seasonally to hunt and gather other food. The Modoc, Northern Paiute, and Achomawi shared Goose Lake Valley, the Modoc have also been known as the Modok. In the 1820s, Peter Skene Ogden, an explorer for the Hudsons Bay Company, brothers Jesse and Lindsay Applegate, accompanied by 13 other white settlers, established the Applegate Trail, or South Emigrant Trail, in 1846. It connected a point on the Oregon Trail near Fort Hall, Idaho, the new route was created to encourage European-Americans to come to western Oregon, and to eliminate the hazards encountered on the Columbia Route. Since the British Hudsons Bay Company controlled the Columbia Route, development of an alternate route enabled migration even if there were trouble between the United States and the United Kingdom, the Applegate brothers became the first known white people in present-day Lava Beds National Monument. The opening of the Applegate Trail appeared to bring the first regular contact between the Modoc and the European-American settlers, who had ignored their territory before. Many of the events of the Modoc War took place along the trail, from 1846 to 1873, thousands of emigrants entered the Modoc territory. Beginning in 1847, the Modoc raided the invading emigrants on the Applegate Trail under the leadership of Old Chief Schonchin. In September 1852, the Modoc destroyed an emigrant train at Bloody Point on the east shore of Tule Lake, killing all, the Modoc took two young girls as captives. One or both of them may have killed several years later by jealous Modoc women
Modoc people
–
Toby "Winema" Riddle (Modoc, 1848–1920)
Modoc people
–
Chief Yellow Hammer painted in traditional clothing by
E.A Burbank, 1901.
Modoc people
–
L to R, standing: US Indian agent,
Winema (Tobey) Riddle, a Modoc; and her husband Frank Riddle, with four Modoc women sitting in the front two rows. Photographed by
Eadweard Muybridge, 1873.
Modoc people
–
Kintpuash (Captain Jack), a Modoc leader in the Modoc War.
44.
Achomawi
–
In anthropology, Achomawi are the northerly nine bands of the Pit River tribe of Native Americans who lived in what is now northeastern California in the United States. These nine autonomous bands of the Pit River Indians spoke various dialects of one language. The name Achomawi means river dwelling and the band historically inhabited the Fall River Valley, the other eight bands that shared the Achomawi language had a historic homeland located along other parts of the Pit River. Their territory extended from Big Bend to Goose Lake, estimates for the pre-contact populations of most native groups in California have varied substantially. Alfred L. Kroeber estimated the combined 1770 population of the Achomawi and Atsugewi as 3,000, a more detailed analysis by Fred B. Kniffen arrived at the same figure, T. R. Garth estimated the Atsugewi population at a maximum of 850, which would leave at least 2,150 for the Achomawi. Kroeber estimated population of the Achomawi 1910 as 1,000, edward S. Curtis, a photographer and author in the 1920s, gave a 1910 population of Achomawi at 984. The Achomawi population was estimated at 1,500 in 2000, each of the nine bands in the Achomawi language group had defined separate territories up and down the banks of the Pit River. Within their respective territories, each band had several villages, which were composed of extended family members. The bands were organized by having one village with smaller satellite villages. The lower Pit River bands existed in a densely forested mountain zone, while the upper Pit River bands had a drier sage brush. Their housing, food sources, and seasonal movements therefore also varied, in the summer, the Achomawi band, and other upper Pit River bands usually lived in cone-shaped homes covered in tule-mat and spent time under shade or behind windbreaks of brush or mats. In the winter, larger houses were built, partially underground, these winter homes had wooden frames which supported a covering made of a mix of bark, grass and tule. In marriage, the bridegroom lived in the home briefly. Eventually she would move him to his family. A patrilineal society, chiefdom was handed down to the eldest son, when children were born, the parents would were put into seclusion and had food restrictions while waiting for their babies umbilical cord to fall off. If twins were born, one of them was killed at birth, Achomawi buried their dead in a flexed position, on the side, facing east and at times in baskets. They also cremated those who died outside of the community, bringing the back for burial back home
Achomawi
–
Achomawi woman (circa 1920)
Achomawi
–
Achomawi man (circa 1923)
Achomawi
–
Achomawi basket-maker in 1923
45.
Karuk
–
The Karuk people are an indigenous people of California, and the Karuk Tribe is one of the largest tribes in California. Karuks are also enrolled in two federally recognized tribes, the Cher-Ae Heights Indian Community of the Trinidad Rancheria and the Quartz Valley Indian Community. Happy Camp, California is located in the heart of the Karuk Tribes ancestral territory, the name Karuk, also spelled Karok, means upriver people, or upstream people, and are called Chum-ne in Tolowa. The Karuk people speak the Karuk language, a language isolate, the tribe has an active language revitalization program. Estimates for the populations of most native groups in California have varied substantially. Alfred L. Kroeber proposed a population for the Karuk of 1,500 in 1770, sherburne F. Cook initially estimated it as 2,000, later raising this figure to 2,700. In 1910, Kroeber reported the population of the Karuk as 800. According to the 2010 census, there were 6,115 Karuk individuals, since time immemorial, the Karuk resided in villages along the Klamath River, where they continue such cultural traditions as hunting, gathering, fishing, basket making and ceremonial dances. The Karuk were the only California tribe to grow tobacco plants, in the summers of 1871 and 1872, an amateur ethnographer by the name of Stephen Powers visited Indian groups in Northern California. His published observations offer an insight into the lives of the survivors of the California Gold Rush. According to Powers, the Karok were one of three groups living on the Klamath River and he also noted that there was no recollection of any ancient migration to the region, instead there were legends of Creation and the Flood which were fabled to have occurred on the Klamath. Some of Powers other observations were, The Karok are very democratic, after her comes the root-doctor, and with numerous potions, poultices, etc. seeks to medicate the part where the other has discovered the ailment resides. They call it sif-san-di pik-i-a-vish…which signifies, literally, working the earth, the object of it is to propitiate the spirits of the earth and the forest, in order to prevent disastrous landslides, forest fires, earthquakes, drought, and other calamities. The Karuk developed sophisticated usage of plants and animals for their subsistence and these practices not only consisted of food harvesting from nature, but also the use of plant and animal materials as tools, clothing and pharmaceuticals. The Karuk cultivated a form of tobacco, and used fronds of the Coastal woodfern, documentary film produced for the Truly California series. Rob Cabitto, author of a memoir about his struggles with identity, Jetty Rae, musician whose grandmother, Jetty Rae Thom, was a full-blooded Karuk. Naomi Lang, figure skater, Five time US Champion in ice dancing from 1999 to 2003, as a member of the 2002 US Olympic figure skating team, she was the first Native American woman to compete in the Winter Olympics. Her great-great-grandmother, Bessie Tripp, was a full blooded Karuk from Orleans/Salmon River
Karuk
–
Karuk folk singer
Jetty Rae
46.
Klamath people
–
The Klamath people are a Native American tribe of the Plateau culture area in Southern Oregon and Northern California. Today Klamath people are enrolled in the recognized tribes, Klamath Tribes, Oregon Quartz Valley Indian Community. The Klamath people lived in the area around the Upper Klamath Lake and the Klamath, Williamson and they subsisted primarily on fish and gathered roots and seeds. While there was knowledge of their neighbors, apparently the Klamath were unaware of the existence of the Pacific Ocean. Gatschet has described this position as leaving the Klamath living in an isolation from outside cultures. The Klamath were known to neighboring tribes, such as the Achomawi on the Pit River. They traded with the Wasco-Wishram at The Dalles, however, scholars such as Alfred L. Kroeber and Leslie Spier consider these slaving raids by the Klamath to begin only with the acquisition of the horse. These natives made southern Oregon their home for enough to witness the eruption of Mount Mazama. It was a volcanic mountain who is the creator of Crater Lake. In 1826, Peter Skene Ogden, an explorer for the Hudsons Bay Company, first encountered the Klamath people, the United States frontiersman Kit Carson admired their arrows, which were reported to be able to shoot through a house. This area was part of the traditional territory controlled by the ă′ukuckni Klamath band. The treaty required the tribes to cede the land in the Klamath Basin, bounded on the north by the 44th parallel, to the United States. In return, the United States was to make a lump sum payment of $35,000, the tribes requested Lindsay Applegate as the agent to represent the United States to them. The Indian agent estimated the population of the three tribes at about 2,000 when the treaty was signed. Since termination of recognition of their sovereignty in 1954, the Klamath and neighboring tribes have reorganized their government. The Klamath, along with the Modoc and Yahooskin, have formed the federally recognized Klamath Tribes confederation and their tribal government is based in Chiloquin, Oregon. Some Klamath live on the Quartz Valley Indian Community in Siskiyou County, traditionally there were several cultural subdivisions among the Klamath, based on the location of their residency within the Klamath Basin. Despite this, the five recognized tribelets mutually considered each other the same ethnic group, like many Indigenous cultures of the Pacific Northwest, the Klamath lived a semi-sedentary life
Klamath people
–
Elderly Klamath woman by
Edward S. Curtis, 1924
Klamath people
–
A Klamath man
Klamath people
–
Klamath people in dugout canoes, 19th century
47.
Yana people
–
The Yana are a group of Native Americans indigenous to Northern California in the central Sierra Nevada, on the western side of the range. Their lands bordered the Yuba and Feather rivers, the Yana-speaking people comprised four groups, the Northern Yana, the Central Yana, the Southern Yana, and the Yahi. The noun stem Ya- means person, the suffix is -na in the northern Yana dialects. The Yana continue to be in California as members of Redding Rancheria and they lived on wild game, salmon, fruit, acorns and roots. Their territory was approximately 2400 square miles, or more than 6000 km2, and contained mountain streams, gorges, boulder-strewn hills, each group had relatively distinct boundaries, dialects and customs. After James W. Marshall discovered gold in 1848, tens of thousands of gold-miners and ranchers flocked into Yana territory, Yana territory was seized, especially the lands around the Yuba and Feather rivers, where the Yana fished for salmon, a major source of food. The food supply dropped dramatically, as gold mining damaged the streams and fish runs, the Yahi were the southernmost portion of the Yana. They were hunter-gatherers who lived in small bands without centralized political authority. The Yahi initially numbered around 400, the Yahi were the first Yana group to suffer from the Californian Gold Rush, as their lands were the closest to the gold mines. They suffered great losses from the loss of their traditional food supplies. Lacking firearms, they were destroyed by armed white settlers in multiple raids, the settlers were led by Indian hunter Robert Anderson, whose men launched two raids in 1865 which killed about seventy people combined. The massacre reduced the Yahi, who were suffering from starvation. On August 6,1866, seventeen settlers raided a Yahi village at dawn, in the same year, more Yahis were massacred when they were caught by surprise in a ravine. Around 1867, thirty-three Yahis were killed after being tracked to a north of Mill Creek. Finally around 1871, four cowboys trapped and killed about thirty Yahis in Kingsley cave, the last known survivor of the Yahi was named Ishi by American anthropologists. Ishi had spent most of his life in hiding with his members in the Sierra wilderness, emerging at the age of about 49, after the deaths of his mother. He was the only Yahi known to European-Americans, Ishi emerged from the mountains near Oroville, California on August 29,1911, having lived his entire life outside of the European-American culture. Professors from the University of California, Berkeley read about him, called the last wild Indian, he had been treated as a curiosity by the public
Yana people
–
Ishi, the last known survivor of the Yahi.
Yana people
–
Pre-contact Yana territory
48.
Peter Skene Ogden
–
Peter Skene Ogden, was a fur trader and a Canadian explorer of what is now British Columbia and the American West. Ogden was a son of Chief Justice Isaac Ogden of Quebec, the family was descended from a 17th-century British emigrant to the American colonies. His father Isaac and grandfather were loyalists during the American Revolution and his father relocated to England at this time, then later returned to British-run Quebec. One of Ogdens brothers, Charles Richard Ogden was a lawyer, politician, Ogden married Julia Rivet/Reava, a Meti/Nez Perce. During his many expeditions, he explored parts of Oregon, Washington, Nevada, California, Utah, Idaho, after a brief time with the American Fur Company, he joined the North West Company in 1809. His first post was at Île-à-la-Crosse, Saskatchewan, in 1810, Ogden had frequent run-ins with the rival HBC employees and engaged in physical violence on several occasions. In 1816, HBC clerks reported that Ogden killed an Indian who had traded with the Hudsons Bay Company, the Indian was butchered in a most cruel manner, according to HBC officer James Bird. Ogden was charged with murder, and the North West Company moved him further west to attempt to avoid any confrontations with the HBC. He served at different posts in modern-day Oregon, Washington, as a way of ending the ongoing strife between the two companies, the HBC and the North West Company merged in 1821. Ogdens violent history placed the now larger HBC in a quandary, the company management severely disliked and distrusted Ogden, but finally agreed that he had done no more than many others during the fur-trade wars. He was promoted to the rank of Chief Trader in 1823, between 1824 and 1830, Ogden set out on a series of expeditions to explore the Snake River country. One of the objectives was to bring as many furs from this area as possible to the HBC so as to create a fur desert. This would discourage inroads by American trappers and traders, the exploration trips included, 1824–25, Ogden led a fur brigade which expanded HBCs influence along the Snake River east to Montanas Bitterroot River and south to the Bear River in modern Utah. During this trip some 15 freemen, independent trappers outfitted by HBC, 1825–26, Traveling south from the Columbia River to the Deschutes River in Oregon, Ogden then turned east and traveled through the Blue Mountains to the Snake River. 1826–27, From Walla Walla, in present-day Washington, this expedition explored the Deschutes River, following it to Klamath Lake. 1828–29, Ogden explored the Great Salt Lake and the Weber River drainage, where the Ogden River, and subsequently the current city of Ogden, Utah, are named for him. He explored areas of the western Great Basin, finding and following the later named for the German naturalist Alexander von Humboldt 330 miles west to its dry sink in modern-day Nevada. Jedediah Strong Smith, an American fur trapper and explorer, was the first American to cross the Great Basin in 1827 and he traversed the basin west to east from the Sierra Nevada near Ebbetts Pass
Peter Skene Ogden
–
Peter Skene Ogden
Peter Skene Ogden
–
Historical Marker at
Peter Skene Ogden State Scenic Viewpoint
49.
Mount McLoughlin
–
Mount McLoughlin is a steep-sided lava cone built on top of a composite volcano in the Cascade Range of southern Oregon and within the Sky Lakes Wilderness. It is one of the peaks in the Cascade Volcanic Arc. The mountain is north of Mount Shasta, south of Crater Lake and it was named around 1838 after John McLoughlin, a Chief Factor for the Hudsons Bay Company. Mount McLoughlin has been known by a number of different names over the years, including Mount Pitt, Big Butte, Mlaiksini Yaina, Malsi, Mount Shasty, the Pacific Crest Trail skirts the eastern and northern sides and also accesses the only trail to the summit. On a clear day, the Sky Lakes Wilderness, Crater Lake, the Rogue Valley, except for a short monograph written by Arthur B. Emmons in 1886, little was known about Mount McLoughlins geology until the 1970s, much of what is known today comes from LeRoy Maynard of the Center for Volcanology at the University of Oregon. The 3-cubic-mile volcano went through three or four stages of development and stopped growing some time before the most recent period of glaciation about 25,000 years ago, a steep-sided pre-existing shield volcano may exist within the cinder cone, thus explaining its extreme height. Some lava is associated with this stage but is confined to the parts of the cinder cone. A second cone-building stage was characterized by large lava flows that poured out of a summit crater. The third stage of development consisted of floods of blocky andesite lava erupting from below the summit and more fluid lavas erupting from basal fissures, north Squaw Tip and South Squaw Tip on McLoughlins west flank now mark the site of the two major blocky flow vents. There were two smaller vents as well, the entire third stage is thought to have happened in the Holocene period, after the last ice age, due to a general lack of weathering and fresh appearance of the solidified lava. During the last ice age, an ice cap buried most of the High Cascades. The ice cap was 200 to 300 feet thick where it touched the mountain, a large ice-age glacier on the northeast side of the volcano severely eroded that part of the mountain, creating an asymmetrical cone. A cirque glacier occupied part of the depression early in the 20th century. The volcanos crest is located south of the vent. Volcanic Legacy Scenic Byway Mount McLoughlin
Mount McLoughlin
–
Mount McLoughlin from across Willow Lake
Mount McLoughlin
–
British Columbia
