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. [Please select]
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When the jaeger was ready to strike in order to make the loon drop the fish it was carrying, the loon dropped over the erosional cliff and splashed into the water. [Please select]
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The first erosional bench supported grasses and sedges and the slopes were covered with willows from a few inches to seven feet high. [Please select]
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