Question

Plain occupied about only
Half the world's land surface but supports more than 90percent of the population

Answer 1

Answer:

Because of suitable conditions for agriculture.

Explanation:

1. The soil found is very fertile.
2. The soil is rich in phosphoric acid,lime,etc.
3. Any  type of crop can be grown.
4. The crops are good.
5. The soil lacks in humus.

→Due to all the above factors, people lives near plains mainly for cultivation.

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Answer 2

Answer:

The reasons are: (i) Density of population is high in river valleys due to water availability through rivers and canals. The soil and water makes the land usable for agriculture. (ii) The plains are densely populated while hilly areas and desserts are sparsely populated