write the features of the upper course and lower course
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Upper course - The gradient is really steep but the velocity is slow moving because of the vast amount of friction. ... Lower course - The gradient levels off, but the speed of the river is very fast because there is a low amount of friction acting on the river water.
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In the lower course of the river the gradient is gentler than in the upper course. ...
In the lower course there is more lateral (sideways) erosion. ...
As the river erodes sideways, it swings from side to side, forming large bends called meanders.
Over time the loop of a meander becomes tighter.
Explanation:
In the upper course of a river gradients are steep and river channels are narrow. Vertical erosion is greatest in the upper course of a river. As the result of this typical features include steep valley sides, interlocking spurs, rapids, gorges and waterfalls
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