1.
City
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A city is a large and permanent human settlement. Cities generally have complex systems for sanitation, utilities, land usage, housing, a big city or metropolis usually has associated suburbs and exurbs. Such cities are associated with metropolitan areas and urban areas. Once a city expands far enough to another city, this region can be deemed a conurbation or megalopolis. Damascus is arguably the oldest city in the world, in terms of population, the largest city proper is Shanghai, while the fastest-growing is Dubai. There is not enough evidence to assert what conditions gave rise to the first cities, some theorists have speculated on what they consider suitable pre-conditions and basic mechanisms that might have been important driving forces. The conventional view holds that cities first formed after the Neolithic revolution, the Neolithic revolution brought agriculture, which made denser human populations possible, thereby supporting city development. The advent of farming encouraged hunter-gatherers to abandon nomadic lifestyles and to settle near others who lived by agricultural production, the increased population density encouraged by farming and the increased output of food per unit of land created conditions that seem more suitable for city-like activities. In his book, Cities and Economic Development, Paul Bairoch takes up position in his argument that agricultural activity appears necessary before true cities can form. According to Vere Gordon Childe, for a settlement to qualify as a city, it must have enough surplus of raw materials to support trade and a relatively large population. To illustrate this point, Bairoch offers an example, Western Europe during the pre-Neolithic, when the cost of transport is taken into account, the figure rises to 200,000 square kilometres. Bairoch noted that this is roughly the size of Great Britain, the urban theorist Jane Jacobs suggests that city formation preceded the birth of agriculture, but this view is not widely accepted. In his book City Economics, Brendan OFlaherty asserts Cities could persist—as they have for thousands of years—only if their advantages offset the disadvantages, OFlaherty illustrates two similar attracting advantages known as increasing returns to scale and economies of scale, which are concepts usually associated with businesses. Their applications are seen in more basic economic systems as well, increasing returns to scale occurs when doubling all inputs more than doubles the output an activity has economies of scale if doubling output less than doubles cost. To offer an example of these concepts, OFlaherty makes use of one of the oldest reasons why cities were built, in this example, the inputs are anything that would be used for protection and the output is the area protected and everything of value contained in it. OFlaherty then asks that we suppose the protected area is square, the advantage is expressed as, O = s 2, where O is the output and s stands for the length of a side. This equation shows that output is proportional to the square of the length of a side, the inputs depend on the length of the perimeter, I =4 s, where I stands for the quantity of inputs. So there are increasing returns to scale, O = I2 /16 and this equation shows that with twice the inputs, you produce quadruple the output
2.
Rocky Mountains
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The Rocky Mountains, commonly known as the Rockies, are a major mountain range in western North America. The Rocky Mountains stretch more than 3,000 miles from the northernmost part of British Columbia, in western Canada, to New Mexico, in the Southwestern United States. Within the North American Cordillera, the Rockies are somewhat distinct from the Pacific Coast Ranges, the Rocky Mountains were initially formed from 80 million to 55 million years ago during the Laramide orogeny, in which a number of plates began to slide underneath the North American plate. The angle of subduction was shallow, resulting in a belt of mountains running down western North America. Since then, further tectonic activity and erosion by glaciers have sculpted the Rockies into dramatic peaks, at the end of the last ice age, humans started to inhabit the mountain range. The first mention of their present name by a European was in the journal of Jacques Legardeur de Saint-Pierre in 1752, the Rocky Mountains are commonly defined as stretching from the Liard River in British Columbia south to the Rio Grande in New Mexico. The United States definition of the Rockies includes the Cabinet and Salish Mountains of Idaho and their counterparts north of the Kootenai River, the Columbia Mountains, are considered a separate system in Canada, lying to the west of the huge Rocky Mountain Trench. This runs the length of British Columbia from its beginnings in the middle Flathead River valley in western Montana to the bank of the Liard River. The Rockies vary in width from 70 to 300 miles, also west of the Rocky Mountain Trench, farther north and facing the Muskwa Range across the trench, are the Stikine Ranges and Omineca Mountains of the Interior Mountains system of British Columbia. A small area east of Prince George, British Columbia on the side of the Trench. In Canada geographers define three main groups of ranges, the Continental Ranges, Hart Ranges and Muskwa Ranges, the Muskwa and Hart Ranges together comprise what is known as the Northern Rockies. The western edge of the Rockies includes ranges such as the Wasatch near Salt Lake City, the Great Basin and Columbia River Plateau separate these sub-ranges from distinct ranges further to the west, most prominent among which are the Sierra Nevada, Cascade Range and Coast Mountains. The Rocky Mountain System within the United States is a United States physiographic region, the Rocky Mountains are notable for containing the highest peaks in central North America. The ranges highest peak is Mount Elbert located in Colorado at 14,440 feet above sea level, Mount Robson in British Columbia, at 12,972 feet, is the highest peak in the Canadian Rockies. The Continental Divide of the Americas is located in the Rocky Mountains, triple Divide Peak in Glacier National Park is so named because water that falls on the mountain reaches not only the Atlantic and Pacific, but Hudson Bay as well. Farther north in Alberta, the Athabasca and other rivers feed the basin of the Mackenzie River, see Rivers of the Rocky Mountains for a list of rivers. Human population is not very dense in the Rocky Mountains, with an average of four people per square kilometer, however, the human population grew rapidly in the Rocky Mountain states between 1950 and 1990. The 40-year statewide increases in range from 35% in Montana to about 150% in Utah
3.
Colorado
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Colorado is a state in the United States encompassing most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is part of the Western United States, the Southwestern United States, Colorado is the 8th most extensive and the 21st most populous of the 50 United States. The United States Census Bureau estimates that the population of Colorado was 5,540,545 on July 1,2016, the state was named for the Colorado River, which Spanish travelers named the Río Colorado for the ruddy silt the river carried from the mountains. The Territory of Colorado was organized on February 28,1861, Colorado is nicknamed the Centennial State because it became a state in the same year as the centennial of the United States Declaration of Independence. Colorado is noted for its landscape of mountains, forests, high plains, mesas, canyons, plateaus, rivers. Denver is the capital and the most populous city of Colorado, residents of the state are properly known as Coloradans, although the term Coloradoan has been used archaically and lives on in the title of Fort Collins newspaper, the Coloradoan. Colorado, Wyoming and Utah are the states which have boundaries defined solely by lines of latitude and longitude. The summit of Mount Elbert at 14,440 feet elevation in Lake County is the highest point in Colorado, Colorado is the only U. S. state that lies entirely above 1,000 meters elevation. The point where the Arikaree River flows out of Yuma County, Colorado and this point, which holds the distinction of being the highest low elevation point of any state, is higher than the high elevation points of 18 states and the District of Columbia. A little less than one half of the area of Colorado is flat, East of the Rocky Mountains are the Colorado Eastern Plains of the High Plains, the section of the Great Plains within Nebraska at elevations ranging from roughly 3,350 to 7,500 feet. The Colorado plains were mostly prairies, but they have many patches of forests, buttes. Eastern Colorado is presently covered in farmland and rangeland, along with small farming villages. Precipitation is fair, averaging from 15 to 25 inches annually, corn, wheat, hay, soybeans, and oats are all typical crops, and most of the villages and towns in this region boast both a water tower and a grain elevator. Irrigation water is available from the South Platte, the Arkansas River, and a few other streams, however, heavy use of ground water from wells for irrigation has caused underground water reserves to decline. As well as agriculture, eastern Colorado hosts considerable livestock, such as cattle ranches. Roughly 70% of Colorados population resides along the edge of the Rocky Mountains in the Front Range Urban Corridor between Cheyenne, Wyoming, and Pueblo, Colorado. This region is protected from prevailing storms that blow in from the Pacific Ocean region by the high Rockies in the middle of Colorado. The Front Range includes Denver, Boulder, Fort Collins, Loveland, Colorado Springs, Pueblo, Greeley and other townships, on the other side of the Rockies, the significant population centers in Western Colorado are the cities of Grand Junction, Durango, and Montrose
4.
Settler
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A settler is a person who has migrated to an area and established a permanent residence there, often to colonize the area. Settlers are generally from a culture, as opposed to nomads who share. Settlements are often built on land already claimed or owned by another group, many times settlers are backed by governments or large countries. One can witness how settlers very often occupied land previously home to long-established peoples, the word settler was not originally usually used in relation to free labour immigrants, such as slaves, indentured labourers, or convicts. In United States history it refers to people who helped to settle new lands. In this usage, pioneers are usually among the first to an area, whereas settlers can arrive after first settlement and this correlates with the work of military pioneers who were tasked with construction of camps before the main body of troops would arrive at the designated campsite. In Imperial Russia, the government invited Russians or foreign nationals to settle in sparsely populated lands, see, e. g. articles Slavo-Serbia, Volga German, Volhynia, Russians in Kazakhstan. In the Middle East, there are a number of references to various squatter, among those, Iraq – the Arabization program of the Baath Party in the late 1970s in North Iraq, which aimed at settling Arab populations instead of Kurds following the Second Iraqi-Kurdish War. Israel – Israelis who moved to areas captured during the Six-Day War in 1967 are termed Israeli settlers, in recent Israeli settlers have been settling in Palestinian territory such as the Gaza Strip and West Bank. However, this has caused political unrest and many settlers are forcibly removed from their settlements by the Israeli government, Syria – In recent times, Arab settlers have also moved in large numbers to ethnic minority areas, such as northeast Syria. Women and children experience violence in these highly dangerous ares because of the conflict, many natives face displacement when new settlements are established. During 1948 Palestine war, in which Israel was created, over 750,000 Palestinians were displaced from their homes, oftentimes fences or walls are built preventing the natives from traveling back onto the land. Settlements make it difficult for native people to continue their work. For example, if the settlers take part of the land which the trees grow on then the natives no longer have access to those olive trees. Many are met with violence when they try to get the things they need from the land, settlers in hypothetical societies, such as on other planets, often feature in science fiction or fantasy fiction and/or video games. Mascot for Texas Womans University, more specifically called the Pioneer. The colony concerned is sometimes controlled by the government of a home country
5.
ZIP Code
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ZIP Codes are a system of postal codes used by the United States Postal Service since 1963. The term ZIP, an acronym for Zone Improvement Plan, was chosen to suggest that the travels more efficiently, and therefore more quickly. The basic format consists of five numerical digits, an extended ZIP+4 code, introduced in 1983, includes the five digits of the ZIP Code, a hyphen, and four additional digits that determine a more specific location within a given ZIP Code. The term ZIP Code was originally registered as a servicemark by the U. S. Postal Service, USPS style for ZIP is all caps and the c in code is also capitalized, although style sheets for some publications use sentence case or lowercase. The early history and context of postal codes began with postal district/zone numbers, the United States Post Office Department implemented postal zones for numerous large cities in 1943. For example, Mr. John Smith 3256 Epiphenomenal Avenue Minneapolis 16, by the early 1960s a more organized system was needed, and on July 1,1963, non-mandatory five-digit ZIP Codes were introduced nationwide. Three months later, on October 1,1963, the U. S, an earlier list in June had proposed capitalized abbreviations ranging from two to five letters. The abbreviations have remained unchanged, with one exception, according to the historian of the U. S. Robert Moon, an employee of the post office, is considered the father of the ZIP Code, he submitted his proposal in 1944 while working as a postal inspector. The post office gives credit to Moon only for the first three digits of the ZIP Code, which describe the sectional center facility or sec center, an SCF is a central mail processing facility with those three digits. The SCF sorts mail to all post offices with those first three digits in their ZIP Codes, the mail is sorted according to the final two digits of the ZIP Code and sent to the corresponding post offices in the early morning. Sectional centers do not deliver mail and are not open to the public, Mail picked up at post offices is sent to their own SCF in the afternoon, where the mail is sorted overnight. The United States Post Office used a character, which it called Mr. ZIP. He was often depicted with a such as USE ZIP CODE in the selvage of panes of stamps or on labels contained in, or the covers of. In 1983, the U. S. Postal Service introduced an expanded ZIP Code system that it called ZIP+4, often called plus-four codes, add-on codes, or add ons. But initial attempts to promote use of the new format met with public resistance. For Post Office Boxes, the rule is that each box has its own ZIP+4 code. However, there is no rule, so the ZIP+4 Code must be looked up individually for each box. It is common to use add-on code 9998 for mail addressed to the postmaster,9999 for general delivery, for a unique ZIP Code, the add-on code is typically 0001
6.
Interstate 25 in Colorado
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In the U. S. state of Colorado, Interstate 25 follows the north–south corridor through Colorado Springs and Denver. The highway enters the state from the north near Carr and exits the state near Starkville, the highway also runs through the cities of Fort Collins, Loveland, and Pueblo. The route is concurrent with U. S. Highway 87 through the length of the state. I-25 replaced U. S. Highway 87 and most of U. S. Highway 85 for through traffic, historical nicknames for this route have included the Valley Highway, Monument Valley Highway, and the Pueblo Freeway. Within El Paso County, the route has been dedicated as the Ronald Reagan Highway, in Pueblo County, the route is called John F. Kennedy Memorial Highway. Interstate 25 is also considered to be part of the unofficial Pan-American Highway, the route turns from north to west-northwest as I-25 serves Wootton. After leaving Wootton, I-25 turns back up north and bypasses near the east side of the Trinidad Lake State Park, Trinidad, a city near the Trinidad Lake, is the first major city that lies along I-25. For the next 30 miles, I-25 continues north through the areas of Colorado until it reaches the small city of Walsenburg. I-25 then continues in a north-northwest direction until it bypasses the Orlando Reservoir, in Colorado City, I-25 interchanges with the east end of the Frontier Pathways Scenic and Historic Byway at exit 74. The Arkansas River in Pueblo serves as a feeder to the Lake Pueblo State Park, home of the Pueblo Lake, which is located to the west of the western city limits of Pueblo. After leaving Pueblo, I-25 continues up north with the Union Pacific Railroad line paralleling closely to the route on the side after interchanging with Porter Draw at exit 106. By exit 119, the Fountain Creek joins along and travels parallel with I-25, I-25 gradually turns from a general north direction to the north-northwest and serves the census-designated place of Buttes at exit 122. As soon as US85 leaves I-25 at exit 128, I-25 enters the city limits of Fountain, basically, I-25 serves as the border between the western city limits of Fountain on the east side of I-25 and Fort Carson on the west side. Exit 132 serves the north side of the Fountain Creek Regional Park as well as the entrance to Fort Carson and connects to SH21, the eastern bypass for the Colorado Springs metro area. By the time I-25 reaches exit 138, the route crosses into the city limits of Colorado Springs, I-25 turns west at exit 140, along with the Fountain Creek, where it interchanges with US85, US87, and I-25 Bus. I-25 again turns north by exit 141. Swinging around the west side of downtown Colorado Springs at exit 142, and to the north of the city lies the Colorado College, continuing north and northeast, the highway intersects the north terminus of I-25 Bus. and US85. The interstate leaves Colorado Springs between exits 153 and 156, where I-25 enters the United States Air Force Academy, going through the east side of the institution
7.
Suburb
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A suburb is a residential area or a mixed use area, either existing as part of a city or urban area or as a separate residential community within commuting distance of a city. In some areas, such as Australia, China, New Zealand, the United Kingdom, and a few U. S. states, new suburbs are routinely annexed by adjacent cities. In others, such as Arabia, Canada, France, and much of the United States, Suburbs first emerged on a large scale in the 19th and 20th centuries as a result of improved rail and road transport, which led to an increase in commuting. Suburbs tend to proliferate around cities that have an abundance of adjacent flat land, the English word is derived from the Old French subburbe, which is in turn derived from the Latin suburbium, formed from sub and urbs. The first recorded usage of the term in English, was made by John Wycliffe in 1380, in Australia and New Zealand, suburbs have become formalised as geographic subdivisions of a city and are used by postal services in addressing. In rural areas in both countries, their equivalents are called localities, the terms inner suburb and outer suburb are used to differentiate between the higher-density suburbs in proximity to the city center, and the lower-density suburbs on the outskirts of the urban area. The term middle suburbs is also used, Suburbs, in this sense, can range from areas that seem more like residential areas of a city proper to areas separated by open countryside from the city centre. In large cities such as London, suburbs include formerly separate towns and villages that have been gradually absorbed during a growth and expansion. In the United States and Canada, suburb can refer either to an residential area of a city or town or to a separate municipality or unincorporated area outside a town or city. The earliest appearance of suburbs coincided with the spread of the first urban settlements, large walled towns tended to be the focus around which smaller villages grew up in a symbiotic relationship with the market town. The word suburbani was first used by the Roman statesman Cicero in reference to the large villas, as populations grew during the Early Modern Period in Europe, urban towns swelled with a steady influx of people from the countryside. In some places, nearby settlements were swallowed up as the city expanded. The peripheral areas on the outskirts of the city were generally inhabited by the very poorest, by the mid-19th century, the first major suburban areas were springing up around London as the city became more overcrowded and unsanitary. A major catalyst in suburban growth came from the opening of the Metropolitan Railway in the 1860s, the line joined the capitals financial heart in the City to what were to become the suburbs of Middlesex. Harrow was reached in 1880, and the line extended as far as Verney Junction in Buckinghamshire, more than 50 miles from Baker Street. Unlike other railway companies, which were required to dispose of surplus land, in 1912, it was suggested that a specially formed company should take over from the Surplus Lands Committee and develop suburban estates near the railway. However, World War I delayed these plans and it was only in 1919, with expectation of a housing boom. The term Metro-land was coined by the Mets marketing department in 1915 when the Guide to the Extension Line became the Metro-land guide and this promoted the land served by the Met for the walker, visitor and later the house-hunter
8.
Denver
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Denver, officially the City and County of Denver, is the capital and most populous municipality of the U. S. state of Colorado. Denver is in the South Platte River Valley on the edge of the High Plains just east of the Front Range of the Rocky Mountains. The Denver downtown district is immediately east of the confluence of Cherry Creek with the South Platte River, Denver is nicknamed the Mile-High City because its official elevation is exactly one mile above sea level, making it the highest major city in the United States. The 105th meridian west of Greenwich, the reference for the Mountain Time Zone. Denver is ranked as a Beta- world city by the Globalization and World Cities Research Network. With a 2015 estimated population of 682,545, Denver ranks as the 19th-most populous U. S. city, and with a 2. 8% increase in 2015, the city is also the fastest-growing major city in the United States. The 10-county Denver-Aurora-Lakewood, CO Metropolitan Statistical Area had an estimated 2015 population of 2,814,330 and ranked as the 19th most populous U. S. metropolitan statistical area. The 12-city Denver-Aurora, CO Combined Statistical Area had an estimated 2015 population of 3,418,876, which ranks as the 16th most populous U. S. metropolitan area. Denver is the most populous city of the 18-county Front Range Urban Corridor, Denver is the most populous city within a 500-mile radius and the second-most populous city in the Mountain West after Phoenix, Arizona. In 2016, Denver was named the best place to live in the USA by U. S. News & World Report and this was the first historical settlement in what was later to become the city of Denver. The site faded quickly, however, and by the summer of 1859 it was abandoned in favor of Auraria, Larimer named the townsite Denver City to curry favor with Kansas Territorial Governor James W. Denver. Larimer hoped the name would help make it the county seat of Arapaho County but, unbeknownst to him. The location was accessible to existing trails and was across the South Platte River from the site of seasonal encampments of the Cheyenne, the site of these first towns is now the site of Confluence Park near downtown Denver. Larimer, along with associates in the St. Charles City Land Company, sold parcels in the town to merchants and miners, Denver City was a frontier town, with an economy based on servicing local miners with gambling, saloons, livestock and goods trading. In the early years, land parcels were often traded for grubstakes or gambled away by miners in Auraria, in May 1859, Denver City residents donated 53 lots to the Leavenworth & Pikes Peak Express in order to secure the regions first overland wagon route. Offering daily service for passengers, mail, freight, and gold, in 1863, Western Union furthered Denvers dominance of the region by choosing the city for its regional terminus. The Colorado Territory was created on February 28,1861, Arapahoe County was formed on November 1,1861, Denver City served as the Arapahoe County Seat from 1861 until consolidation in 1902. In 1867, Denver City became the territorial capital, with its newfound importance, Denver City shortened its name to Denver
9.
Colorado State Capitol
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The building is intentionally reminiscent of the United States Capitol. Designed by Elijah E. Myers, it was constructed in the 1890s from Colorado white granite, the distinctive gold dome consists of real gold leaf, first added in 1908, commemorating the Colorado Gold Rush. The building is part of Denvers Civic Center area, serving as the beginning of the Capitol Hill district, the historic building sits slightly higher than the rest of downtown Denver. The main entrance hall is open 180 feet to the top of the dome, additionally, the official elevation of Denver is measured outside the west entrance to the building, where the fifteenth step is engraved with the words One Mile Above Sea Level. From this step, at 5,280 feet, the sun can be seen setting behind the Rocky Mountains, a second mile high marker was set in the 18th step in 1969 when Colorado State University students resurveyed the elevation. In 2003, an accurate measurement was made with modern means, and the 3rd step was identified as being one mile high. The interior of the building uses copious amounts of Colorado Rose Onyx, the amount used in the building consumed the entire known supply. White Yule Marble from the quarries near Marble, Colorado was also used throughout the capitol for the floors, many designs have been found in the marble including an image resembling George Washington and another of Molly Brown. A major safety upgrade project, funded by the Colorado State Historical Fund, was started in 2001, the design by Fentress Architects added modern safety features, like enclosed stair towers, that blend in with the original architecture. Many of the windows are stained glass, depicting people or events related to the history of Colorado, the halls are decorated with portraits of every president of the United States. Richardson had participated in major building contracts throughout the United States. State of Colorado Yule marble Wikimedia Commons, Colorado State Capitol Colorado General Assembly, Capitol Tours Colorado State website Biography of Elijah E. Myers, Colorado State website
10.
National Register of Historic Places
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The National Register of Historic Places is the United States federal governments official list of districts, sites, buildings, structures, and objects deemed worthy of preservation. The passage of the National Historic Preservation Act in 1966 established the National Register, of the more than one million properties on the National Register,80,000 are listed individually. The remainder are contributing resources within historic districts, each year approximately 30,000 properties are added to the National Register as part of districts or by individual listings. For most of its history the National Register has been administered by the National Park Service and its goals are to help property owners and interest groups, such as the National Trust for Historic Preservation, coordinate, identify, and protect historic sites in the United States. While National Register listings are mostly symbolic, their recognition of significance provides some financial incentive to owners of listed properties, protection of the property is not guaranteed. During the nomination process, the property is evaluated in terms of the four criteria for inclusion on the National Register of Historic Places, the application of those criteria has been the subject of criticism by academics of history and preservation, as well as the public and politicians. Occasionally, historic sites outside the proper, but associated with the United States are also listed. Properties can be nominated in a variety of forms, including individual properties, historic districts, the Register categorizes general listings into one of five types of properties, district, site, structure, building, or object. National Register Historic Districts are defined geographical areas consisting of contributing and non-contributing properties, some properties are added automatically to the National Register when they become administered by the National Park Service. These include National Historic Landmarks, National Historic Sites, National Historical Parks, National Military Parks/Battlefields, National Memorials, on October 15,1966, the Historic Preservation Act created the National Register of Historic Places and the corresponding State Historic Preservation Offices. Initially, the National Register consisted of the National Historic Landmarks designated before the Registers creation, approval of the act, which was amended in 1980 and 1992, represented the first time the United States had a broad-based historic preservation policy. To administer the newly created National Register of Historic Places, the National Park Service of the U. S. Department of the Interior, hartzog, Jr. established an administrative division named the Office of Archeology and Historic Preservation. Hartzog charged OAHP with creating the National Register program mandated by the 1966 law, ernest Connally was the Offices first director. Within OAHP new divisions were created to deal with the National Register, the first official Keeper of the Register was William J. Murtagh, an architectural historian. During the Registers earliest years in the late 1960s and early 1970s, organization was lax and SHPOs were small, understaffed, and underfunded. A few years later in 1979, the NPS history programs affiliated with both the U. S. National Parks system and the National Register were categorized formally into two Assistant Directorates. Established were the Assistant Directorate for Archeology and Historic Preservation and the Assistant Directorate for Park Historic Preservation, from 1978 until 1981, the main agency for the National Register was the Heritage Conservation and Recreation Service of the United States Department of the Interior. In February 1983, the two assistant directorates were merged to promote efficiency and recognize the interdependency of their programs, jerry L. Rogers was selected to direct this newly merged associate directorate
11.
Gold
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Gold is a chemical element with symbol Au and atomic number 79. In its purest form, it is a bright, slightly yellow, dense, soft, malleable. Chemically, gold is a metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions, Gold often occurs in free elemental form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the element silver and also naturally alloyed with copper. Less commonly, it occurs in minerals as gold compounds, often with tellurium, golds atomic number of 79 makes it one of the higher numbered, naturally occurring elements. It is thought to have produced in supernova nucleosynthesis, from the collision of neutron stars. Because the Earth was molten when it was formed, almost all of the present in the early Earth probably sank into the planetary core. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of acid and hydrochloric acid. Gold also dissolves in solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction, as a precious metal, gold has been used for coinage, jewelry, and other arts throughout recorded history. A total of 186,700 tonnes of gold is in existence above ground, the world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold is also used in infrared shielding, colored-glass production, gold leafing, certain gold salts are still used as anti-inflammatories in medicine. As of 2014, the worlds largest gold producer by far was China with 450 tonnes, Gold is cognate with similar words in many Germanic languages, deriving via Proto-Germanic *gulþą from Proto-Indo-European *ǵʰelh₃-. The symbol Au is from the Latin, aurum, the Latin word for gold, the Proto-Indo-European ancestor of aurum was *h₂é-h₂us-o-, meaning glow. This word is derived from the root as *h₂éu̯sōs, the ancestor of the Latin word Aurora. This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant shining dawn, Gold is the most malleable of all metals, a single gram can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be thin enough to become semi-transparent
12.
South Platte River
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The South Platte River is one of the two principal tributaries of the Platte River. Flowing through the U. S. states of Colorado and Nebraska, it is itself a major river of the American Midwest and it joins the North Platte River in western Nebraska to form the Platte, which then flows across Nebraska to the Missouri. The river serves as the source of water for eastern Colorado. In its valley along the foothills in Colorado, it has permitted agriculture in an area of the Colorado Piedmont and Great Plains that is otherwise arid. The river is formed in Park County, Colorado, southwest of Denver in the South Park grassland basin by the confluence of the South Fork and Middle Fork, approximately 15 miles southeast of Fairplay. Both forks rise along the flank of the Mosquito Range, on the western side of South Park. From South Park, it passes through 50 miles of the Platte Canyon, here, it is joined by the North Fork before emerging from the foothills southwest of the Denver suburb of Littleton. At Littleton, the river is impounded to form Chatfield Reservoir, the river flows north through central Denver, which was founded along its banks at its confluence with Cherry Creek. The valley through Denver is highly industrialized, serving generally as the route for both the lines, as well as Interstate 25. On the north side of Denver it is joined somewhat inconspicuously by Clear Creek, North of Denver it flows through the agricultural heartland of the Piedmont. East of Greeley it turns eastward, flowing across the Colorado Eastern Plains, past Fort Morgan and Brush and it continues past Sterling, and runs into Nebraska between Julesburg, Colorado and Big Springs, Nebraska. In Nebraska, it passes south of Ogallala and joins the North Platte River near the city of North Platte. The South Platte River through Denver is on the U. S. EPAs list of impaired waterbodies for pathogen impairment, other water issues involve the appearance of the New Zealand Mud Snail and of the Zebra Mussel. The South Platte was originally called Niinéniiniicíihéhe by the native Arapaho people who lived on its banks, the early Spanish explorers called it the Rio Chato. The South Platte River also served as a water source in Colorado. Long before the city of Denver was created many travelers came to the South Platte River to escape the arid Great Plains and these people could survive the heat but not without the vital water source that the South Platte River gave them. Buckets and wells sufficed as a system for a while. In an arid region of the United States, the South Platte is marked with several dams, the first notable water impoundment on the South Platte is Antero Reservoir
Westminster
