Question

_is the main work of a river in the upper course​

Answer 1

Answer:

In the upper course the dominant activity of a river is erosion. Many land forms are shaped by this activity of the river. Along its course, it erodes bed and banks, and carries large boulders of rock with it.

Explanation:

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Answer 2

Explanation:

$\huge\red{\underline\orange{\underline\purple{Answer:}}}$In the upper course the dominant activity of a river is erosion. Many land forms are shaped by this activity of the river. Along its course, it erodes bed and banks, and carries large boulders of rock with it.