A) The atmosphere has definite upper limits but gradually thins until it becomes imperceptible.
B) The atmosphere has no definite upper limits but gradually thins until it becomes imperceptible.
C) The atmosphere has definite upper limits but gradually thickens until it becomes imperceptible.
D) The atmosphere has no definite upper limits but gradually thickens until it becomes imperceptible.
Correct Answer: B
Solution :
Our atmosphere has five layers- Troposphere, Stratosphere, Mesophere, Thermo sphere and Exosphere. The exosphere is the outer most layer of the atmosphere showing altitude about from 700 km to 10000 km above sea level. This layer gradually and gradually merges in outer space having no atmosphere.
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