Question

why the plains are more thickly populated than the desert or mountains

Answer 1

Pains are more thickly populated than deserts or mountains because the land on plains is very much more fertile as rivers deposit the fertile soil on that land and that soil is very good for cultivation of crops.

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Answer 2

cause plains have all favorable conditions good transportation , facilities, good education and much more for these facilities people prefer plains over desert an mountains to live