Question

Why valleys are more densely populated than plateaus.
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Answer 1

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River Valleys are densely populated than the plateaus because of the following reasons. ... 2) The climate at the places like river valleys is suitable for agricultural activities as these areas have fertile soil. 3) People live in these areas because fresh water is easily available here.

Answer 2

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Valleys are more densely populated than plateaus because in valleys the soil are fertile more than in plateaus. It is because it's fertility is renew again every annual flooding.

In transportation also, valleys are taken as more important and necessary as due to business. They have high quality transportation.

Plains are people gathering area. They have long growing season with a fertile land for cultivation if crops.But low lying plains suffer from floods.