Question

why does erosion takes place in the upper course of a river??

Answer 1

HEY MATE HERE IS YOUR ANSWER

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. ... As the river or stream wears away the weak rocks, they travel across the surface of stronger rocks.

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Answer 2

This is because soil erosion is the process of washing away of top layer of soil by the action of wind water etc....