A) gravity
B) oxygen between earth and atmosphere
C) both and
D) None of the above
Correct Answer: A
Solution :
Earth is surrounded by an atmosphere of, gases (air). The reason is that in earth's atmosphere the average thermal velocity of even the highest molecules at the maximum possible temperature is small compared to escape velocity which in turn depends^ upon gravity. \[({{v}_{e}}=\sqrt{g{{R}_{e}}})\]. Therefore, the molecules of gases cannot escape from the earth. Hence, an atmosphere exists around the earth.
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