题目内容
Headward erosion lengthens a river toward its head and narrows the drainage divide, resulting in stream capture.
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The ways of rivers erosion include:
According to the relative locations of stretches, a river can be divided into upper reach, middle reach and lower reach.
Meanders occur most commonly in channels that lie in fine-grained stream sediments and have gentle gradients.
A river valley in a cross section is composed of edge, slope, base, bottom, channel and bed.
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