Give reasons for the following:
Erosion is the main work of river in the upper course.
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In the upper course of the river the gradient of the slope is high, therefore, the velocity of the river is also high. So the main action of the river is erosion.
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Distinguish between Weathering and Denudation.
Wind is the main agent of gradation in the arid & semi arid regions.
Weathering is a static phenomenon.
Deposition is the main work of river in the lower course.