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The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
Tuscany (/ ˈ t ʌ s k ə n i / TUSK-ə-nee, Italian: Toscana, Italian: [toˈskaːna]) is a region in central Italy with an area of about 23,000 square kilometres (8,900 square miles) and a population of about 3.8 million inhabitants.
The total volume of water on Earth is estimated at 1.386 billion km 3 (333 million cubic miles), with 97.5% being salt water and 2.5% being freshwater. Of the freshwater, only 0.3% is in liquid form on the surface. [ 2][ 3][ 4] Because the oceans that cover roughly 70.8% of the area of Earth reflect blue light, Earth appears blue from space ...
This list ranks the top 150 U.S. cities (incorporated places) by 2023 land area. Total areas including water are also given, but when ranked by total area, a number of coastal cities appear disproportionately larger. San Francisco is an extreme example: water makes up nearly 80% of its total area of 232 square miles (601 km 2 ).
Harvesting ice near New York City, 1852, showing the vertical lifts used to fill the ice house The 1850s was a period of transition for the ice trade. The industry was already quite large: in 1855 around $6–7 million ($118–138 million in 2010) was invested in the industry in the U.S., and an estimated two million tons (two billion kg) of ...
The inland and intracoastal waterways of the eastern United States. The inland waterways of the United States include more than 25,000 mi (40,000 km) of navigable waters. Much of the commercially important waterways of the United States consist of the Mississippi River System —the Mississippi River and connecting waterways.
A water resource region is the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units as part of the U.S. hydrologic unit system . This first level of classification divides the United States into 21 major geographic areas, or regions.
Top 25 water ports by tonnage. This is a list of ports of the United States, ranked by tonnage. [1] Ports in the United States handle a wide variety of goods that are critical to the global economy, including petroleum, grain, steel, automobiles, and containerized goods. See the articles on individual ports for more information, including ...