Erosional processes have transported small soil particles downslope, while larger rocks and artifacts remained at or near the top of the knoll.
The plains are by no means a simple unit; they are of diverse structure and of various stages of erosional development; they are occasionally interrupted by buttes and escarpments; they are frequently broken by valleys: yet on the whole a broadly extended surface of moderate relief so often prevails that the name, Great Plains, for the region as a whole is well deserved.
The plains are by no means a simple unit; they are of diverse structure and of various stages of erosional development.
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