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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 ...
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]
Water storage. Water storage is a broad term referring to storage of both potable water for consumption, and non potable water for use in agriculture. In both developing countries and some developed countries found in tropical climates, there is a need to store potable drinking water during the dry season. In agriculture water storage, water is ...
Monks Mound is the largest Pre-Columbian earthwork in the Americas and the largest pyramid north of Mesoamerica.The beginning of its construction dates from 900 to 955 CE. Located at the Cahokia Mounds UNESCO World Heritage Site near Collinsville, Illinois, the mound size was calculated in 1988 as about 100 feet (30 m) high, 955 feet (291 m) long including the access ramp at the southern end ...
The four national parks and protected areas spanning the border between the United States and Canada contain the world's largest non-polar ice field and numerous large glaciers. The area, shaped by glacial and continuous tectonic activity, comprises different types of habitats, from high mountains above 16,000 ft (5,000 m) to ocean, coastal ...
Fresh and unpolluted water accounts for 0.003% of total water available globally. [ 3] According to World Bank, India and Brazil has the highest freshwater resources per capita in 2024, ″renewable internal freshwater resources flows refer to internal renewable resources (internal river flows and groundwater from rainfall) in the country.″. [ 4]
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 ).
Memphis Pyramid. Mississippian culture. Monks Mound. Moody Gardens. Museum of History in Granite. Museum of Jewish Heritage.