Question

why are the river plains thickly​

Answer 1

Explanation:

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Plains are usually highly fertile and hence most ideal for cultivation. It is very easy to make transport network in the plains.

Hence, plains are thickly populated.

Hope it helps...

Answer 2

Plains are usually highly fertile and hence most ideal for cultivation. It is very easy to make transport network in the plains. ... Hence, plains are thickly populated.

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