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They are called a "Playa".
By burring into the bottom sediments
Biogeneous sediments
Sediments
They sink to the bottom.
Sediments are deposited when the water flow begins to decrease. When this happens, the water can no longer move the sediment around, therefore, sediments will fall to the bottom.
accumulated sediments on the bottom of the river
sediments
The oldest layers of undisturbed sediment are at the bottom.
basalt
Generically they are called sediments