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Morton Gneiss
Morton gneiss, also known as rainbow gneiss, is an Archean-age gneiss found in the Minnesota River Valley of southwestern Minnesota, United States. It is one of the oldest stones on Earth, at about 3.5 billion years old. Along with the nearby Montevideo Gneiss, it is the oldest intact continental crust rock in the United States. Its type locality is in Morton, Minnesota. Morton gneiss is quarried for monuments and as a facing stone for buildings. Formation The rock known as Morton gneiss started out as a grey granite, formed about 3.5 billion years ago deep beneath the surface of the Earth. The molten rock cooled slowly, forming grains of crystallized minerals. About a billion years later, two fragments of the Earth's crust collided at the future location of southwestern Minnesota, subjecting the granite to heat and pressure. These forces melted it once again and allowed intrusions of molten pink granite. The two granites folded and twisted; when they eventually hardened, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archean
The Archean ( , also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history of Earth, history, preceded by the Hadean Eon and followed by the Proterozoic and the Phanerozoic. The Archean represents the time period from (million years ago). The Late Heavy Bombardment is hypothesized to overlap with the beginning of the Archean. The Huronian glaciation occurred at the end of the eon. The Earth during the Archean was mostly a ocean world, water world: there was continental crust, but much of it was under an ocean deeper than today's oceans. Except for some rare Relict (geology), relict crystals, today's oldest continental crust dates back to the Archean. Much of the geological detail of the Archean has been destroyed by subsequent activity. The Earth's atmosphere was also vastly different in atmospheric chemistry, composition from today's: the prebiotic atmosphere was a reducing atmosphere rich in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Track Ballast
Track ballast is the material which forms the trackbed upon which railroad ties (UK: sleepers) are laid. It is packed between, below, and around the ties. It is used to bear the compression load of the railroad ties, rails, and rolling stock; to facilitate drainage; and keep down vegetation that can compromise the integrity of the combined track structure. Ballast also physically holds the track in place as the trains roll over it. Not all types of railway tracks use ballast. A variety of materials have been used as track ballast, including crushed stone, washed gravel, bank run (unwashed) gravel, torpedo gravel (a mixture of coarse sand and small gravel), slag, chats, coal cinders, sand, and burnt clay. The term "ballast" comes from a nautical term for the stones used to stabilize a ship. Construction The appropriate thickness of a layer of track ballast depends on the size and spacing of the ties, the amount of traffic on the line, and various other factors. Track ballast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington State University
Washington State University (WSU, or colloquially Wazzu) is a Public university, public Land-grant university, land-grant research university in Pullman, Washington, United States. Founded in 1890, WSU is also one of the oldest Land-grant university, land-grant universities in the Western United States, American West. With an undergraduate enrollment of 24,278 and a total enrollment of 28,581, it is the second largest institution of higher education in Washington state behind the University of Washington. It is Carnegie Classification of Institutions of Higher Education, classified among "R1: Doctoral Universities – Very high research activity". The WSU Pullman campus stands on a hill and is characterized by open spaces and a red brick and basalt material palette—materials originally found on site. The university sits within the rolling topography of the Palouse in rural eastern Washington and remains closely connected to the town and the region. The university also operat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cincinnati
Cincinnati ( ; colloquially nicknamed Cincy) is a city in Hamilton County, Ohio, United States, and its county seat. Settled in 1788, the city is located on the northern side of the confluence of the Licking River (Kentucky), Licking and Ohio River, Ohio rivers, the latter of which marks the state line with Kentucky. It is the List of cities in Ohio, third-most populous city in Ohio and List of united states cities by population, 66th-most populous in the U.S., with a population of 309,317 at the 2020 census. The city is the economic and cultural hub of the Cincinnati metropolitan area, Ohio's most populous metro area and the Metropolitan statistical area, nation's 30th-largest, with over 2.3 million residents. Throughout much of the 19th century, Cincinnati was among the Largest cities in the United States by population by decade, top 10 U.S. cities by population. The city developed as a port, river town for cargo shipping by steamboats, located at the crossroads of the Nor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hartford, Connecticut
Hartford is the List of capitals in the United States, capital city of the U.S. state of Connecticut. The city, located in Hartford County, Connecticut, Hartford County, had a population of 121,054 as of the 2020 United States census, 2020 census. Hartford is the most populous city in the Capitol Planning Region, Connecticut, Capitol Planning Region and the core city of the Greater Hartford metropolitan area with 1.17 million residents. Founded in 1635, Hartford is among the oldest cities in the United States. It is home to the country's oldest public art museum (Wadsworth Atheneum), the oldest publicly funded park (Bushnell Park), the oldest continuously published newspaper (the ''Hartford Courant''), the second-oldest secondary school (Hartford Public High School), and the oldest school for deaf children (American School for the Deaf), founded by Thomas Hopkins Gallaudet in 1817. It is the location of the Mark Twain House, in which the author Mark Twain wrote his most famous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milwaukee
Milwaukee is the List of cities in Wisconsin, most populous city in the U.S. state of Wisconsin. Located on the western shore of Lake Michigan, it is the List of United States cities by population, 31st-most populous city in the United States and the fifth-most populous city in the Midwest with a population of 577,222 at the 2020 United States census, 2020 census. It is the county seat of Milwaukee County, Wisconsin, Milwaukee County. The Milwaukee metropolitan area is the Metropolitan statistical area, 40th-most populous metropolitan area in the U.S. with 1.57 million residents. Founded in the early 19th century and incorporated in 1846, Milwaukee grew rapidly due to its location as a port city. History of Milwaukee, Its history was heavily influenced by German immigrants and it continues to be a Germans in Milwaukee, center for German-American culture, specifically known for Beer in Milwaukee, its brewing industry. The city developed as an industrial powerhouse during the 19t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tulsa, Oklahoma
Tulsa ( ) is the List of municipalities in Oklahoma, second-most-populous city in the U.S. state, state of Oklahoma, after Oklahoma City, and the List of United States cities by population, 48th-most-populous city in the United States. The population was 413,066 as of the 2020 United States census, 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, Tulsa metropolitan area, a region with 1,034,123 residents. The city serves as the county seat of Tulsa County, Oklahoma, Tulsa County, the most densely populated county in Oklahoma, with Urban Development, urban development extending into Osage County, Oklahoma, Osage, Rogers County, Oklahoma, Rogers and Wagoner County, Oklahoma, Wagoner counties. Tulsa was settled between 1828 and 1836 by the Lochapoka band of Creek people, Creek Native Americans, and was formally incorporated in 1898. Most of Tulsa is still part of the territory of the Muscogee (Creek) Nation. Northwest Tulsa lies in the Osage Nation wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birmingham, Alabama
Birmingham ( ) is a city in the north central region of Alabama, United States. It is the county seat of Jefferson County, Alabama, Jefferson County. The population was 200,733 at the 2020 United States census, 2020 census, making it the List of municipalities in Alabama, second-most populous city in Alabama, and estimated at 196,357 in 2024. The Birmingham metropolitan area, Alabama, Birmingham metropolitan area had a population of 1.19 million in 2020 and is the largest metropolitan area in Alabama and List of metropolitan statistical areas, 47th-most populous in the US. Birmingham serves as a major regional economic, medical, and educational hub of the Deep South, Piedmont Atlantic Megaregion, Piedmont, and Appalachian regions. Founded in 1871 during the Reconstruction Era of the United States, Reconstruction era, Birmingham was formed through the merger of three smaller communities, most notably Elyton, Alabama, Elyton. It quickly grew into an industrial and transportation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Des Moines, Iowa
Des Moines is the List of capitals in the United States, capital and List of cities in Iowa, most populous city in the U.S. state of Iowa. It is the county seat of Polk County, Iowa, Polk County with parts extending into Warren County, Iowa, Warren County. It is named after the Des Moines River, likely derived from the French "Rivière des Moines" meaning "River of the Monks." The city was incorporated in 1851 as Fort Des Moines and shortened to "Des Moines" in 1857. Its population was 214,133 at the 2020 United States census, 2020 census. The Des Moines metropolitan area, covering six counties, is the Metropolitan statistical area, 81st largest metropolitan area in the U.S. with about 750,000 residents, and is the largest metropolitan area entirely in Iowa. Des Moines is a major center of the United States insurance industry and has a sizable financial services and publishing business base. The city is the headquarters for the Principal Financial Group and Wellmark Blue Cross B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detroit
Detroit ( , ) is the List of municipalities in Michigan, most populous city in the U.S. state of Michigan. It is situated on the bank of the Detroit River across from Windsor, Ontario. It had a population of 639,111 at the 2020 United States census, 2020 census, making it the List of United States cities by population, 26th-most populous city in the United States and the largest U.S. city on the Canada–United States border. The Metro Detroit area, home to 4.3 million people, is the second-largest in the Midwestern United States, Midwest after the Chicago metropolitan area and the 14th-largest in the United States. The county seat, seat of Wayne County, Michigan, Wayne County, Detroit is a significant cultural center known for its contributions to music, art, architecture and design, in addition to its historical automotive and industrial background. In 1701, Kingdom of France, Royal French explorers Antoine de la Mothe Cadillac and Alphonse de Tonty founded Fort Pontc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York City
New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive with a respective county. The city is the geographical and demographic center of both the Northeast megalopolis and the New York metropolitan area, the largest metropolitan area in the United States by both population and urban area. New York is a global center of finance and commerce, culture, technology, entertainment and media, academics, and scientific output, the arts and fashion, and, as home to the headquarters of the United Nations, international diplomacy. With an estimated population in 2024 of 8,478,072 distributed over , the city is the most densely populated major city in the United States. New York City has more than double the population of Los Angeles, the nation's second-most populous city. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chicago
Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of United States cities by population, third-most populous city in the United States after New York City and Los Angeles. As the county seat, seat of Cook County, Illinois, Cook County, the List of the most populous counties in the United States, second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area, often colloquially called "Chicagoland" and home to 9.6 million residents. Located on the shore of Lake Michigan, Chicago was incorporated as a city in 1837 near a Chicago Portage, portage between the Great Lakes and the Mississippi River, Mississippi River watershed. It grew rapidly in the mid-19th century. In 1871, the Great Chicago Fire destroyed several square miles and left more than 100,000 homeless, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
