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GS Geography Physical Geography of World
Q.

Atmospheric pressure exerted on earth is due to:
Explanation:

ANS. (C) 
The atmosphere is made up of gasses. Gasses are physical substances, and all physical substance has weight. The atmosphere is 25 miles thick, and that 25 miles’ thick layer of gasses presses down on earth with a weight of 15 lbs. per square inch because of the gravitational pull. That’s how atmosphere exerts pressure on the earth.

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