Abasin is an area of land that is lower than the surrounding land. Many basins form lakes because water flows down into the lower land; however, this does not always happen. When the basin occurs underwater, for example in sea floors, then it makes little difference—as is also the case for the Kalahari Desert basin, around which all of the land receives too little precipitation or river flow to create a lake. In other cases, the flow of water is accompanied by sediment of different types and, eventually, this can cause significant filling up of the depression. In any case, the long-term changes in climate and terrain mean that any particular configuration will not be permanent. Many hydrocarbon resources are formed as the result of ...

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