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The American Bottom is the flood plain of the Mississippi River in the Metro East region of Southern Illinois, extending from Alton, Illinois, south to the Kaskaskia River. It is also sometimes called "American Bottoms". The area is about 175 square miles (450 km 2), mostly protected from flooding in the 21st century by a levee and drainage ...
Bottom water by an estuary of a river discharging into a saline body exhibits peculiar transport of mud.Due to fresh/saline water intermixing by the estuary, a horizontal isohale gradient is created, with lower salinity levels upstream, which generates the upstream flow of the bottom water.
The floodplain on the Mississippi River from Alton to the Kaskaskia River is the American Bottom, and is the site of the ancient city of Cahokia, and was a region of early French settlement, as well as the site of the first state capital, at Kaskaskia. The extreme southern tip of Illinois is in the Gulf Coastal Plain.
Riverine inputs exited the seaway as coastal jets, while correspondingly drawing in water from the Tethys in the south and Boreal waters from the north. [6] During the late Cretaceous, the Western Interior Seaway went through multiple periods of anoxia, when the bottom water was devoid of oxygen and the water column was stratified. [7]
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A summary of the path of the thermohaline circulation. Blue paths represent deep-water currents, while red paths represent surface currents. The NADW is not the deepest water layer in the Atlantic Ocean; the Antarctic bottom water (AABW) is always the densest, deepest ocean layer in any basin deeper than 4,000 metres (2.5 mi). [27]
I am far from the only American preoccupied with drinking water. According to Our World in Data, the United States was the top consumer of municipal water (for drinking, cooking, and washing ...
The federal minimum wage has been stuck at $7.25 since 2009, not even close to the buying power it once brought workers — which peaked all the way back in the 1960s.