Search results
Results From The WOW.Com Content Network
The Mid-Atlantic Ridge is a mid-ocean ridge (a divergent or constructive plate boundary) located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world. In the North Atlantic, the ridge separates the North American from the Eurasian Plate and the African Plate, north and south of the Azores Triple Junction.
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).
Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.
Major continental divides, showing drainage into the major oceans and seas of the world. Grey areas are endorheic basins that do not drain to the ocean.. A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not ...
A map illustrating various definitions of the boundaries between Asia and Europe A physical map of Europe from 1880, depicting the entirety of the Caucasus as part of the European continent. [70] The threefold division of the Old World into Africa, Asia, and Europe has been in use since the 6th century BC by early Greek geographers such as ...
The Great Basin physiographic section is a geographic division of the Basin and Range Province defined by Nevin Fenneman in 1931. [6] The United States Geological Survey adapted Fenneman's scheme in their Physiographic division of the United States. [7] The "section" is somewhat larger than the hydrographic definition.
The main European watershed is the drainage divide ("watershed") which separates the basins of the rivers that empty into the Atlantic Ocean, the North Sea and the Baltic Sea from those that feed the Mediterranean Sea, the Adriatic Sea and the Black Sea. It stretches from the tip of the Iberian Peninsula at Gibraltar in the southwest to the ...
Geography of Africa. Africa is a continent comprising 63 political territories, representing the largest of the great southward projections from the main mass of Earth 's surface. [1] Within its regular outline, it comprises an area of 30,368,609 km 2 (11,725,385 sq mi), excluding adjacent islands. Its highest mountain is Kilimanjaro; its ...