Discussion
Assertion (A) : In the upper course, the main work of the river is erosion.
Reason (R) : River flows swiftly in the upper course.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
In its upper course a river is steep and swift, so it cuts downward and carves gorges and V-shaped valleys; the sluggish lower course deposits instead. The speed of flow is exactly why erosion dominates upstream. Both are true and R explains A.
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