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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]
The Caspian Sea is the world's largest inland body of water, described as the world's largest lake and usually referred to as a full-fledged sea. [2] [3] [4] An endorheic basin, it lies between Europe and Asia: east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau.
The level of the latter was 110–120 metres (360–390 ft) below the present Caspian level—in other words, 140–150 metres (460–490 ft) below sea level. [ 7 ] [ 8 ] In the Caspian Depression, the Khvalynean sediments occur primarily near the surface; younger still (and higher in the sequence) are the Holocene floodplain lacustrine and ...
The change in the total mass of ice on land, called the mass balance, is important because it causes changes in global sea level. High-precision gravimetry from satellites in low-noise flight has determined that in 2006, the Greenland and Antarctic ice sheets experienced a combined mass loss of 475 ± 158 Gt/yr, equivalent to 1.3 ± 0.4 mm/yr ...
The Caspian's water levels, which have fluctuated sharply during the last century, have been falling since the mid 1990s, scientific studies have found. ... discussed with Russian President ...
Mt. Laurel–Wenonah aquifer; Ogallala Aquifer, also known as the High Plains Aquifer; Ozark Plateau aquifer; Patapsco aquifer; Permian Sea; Potomac–Raritan–Magothy aquifer; Saginaw Aquifer; San Diego Formation [1] San Joaquin River aquifer; Sankoty Aquifer; Silurian–Devonian aquifers; Spokane Valley–Rathdrum Prairie Aquifer [2] [3]
The changing level of the Caspian Sea has resulted in three distinct zones in the delta. The higher areas of the first zone are known as "Baer's mounds," named after researcher Karl Ernst von Baer who worked in this region. These mounds are linear ridges of clayey sands, ranging from 5 to 22 m (16 to 72 ft) in height, and averaging about 8 m ...
The maximum water depth of the lagoon in spring and in the western areas of the lagoon reaches 2.5 meters, which varies due to the fluctuations of the water level of the Caspian Sea. • 9.53%: forest and pasture • 2.33%: Agricultural lands • 7.8%: wetlands, dams and pools • 7.3%: areas used privately by people. [22]