题目内容
The ways of rivers erosion include:
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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.
Streamline is a line of flow. It is an actual line connecting a series of fluid particles in a moving fluid so that, at a given instant, the velocity vector of every particle on that line is tangent to it.
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