Question

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Geographical reasons
The rivers in the northern India are mostly perennial

Answer 1

The rivers of the north India are perennial because they are snow fed, owing to the Himalayas. They have a greater water flow and therefore do not dry in the summers.

The rivers of the southern part of the country in the other hand originate in the small hills, are rain fed and have a lesser water flow than their north India counterparts. They therefore dry up in summers.  

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Answer 2

Explanation:

The rivers of the north India are perennial because they are snow fed, owing to the Himalayas. They have a greater water flow and therefore do not dry in the summers.