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About 75% of total mass of the atmosphere and 90% of its water vapour is contained in the lowest zone which extends from the earth's surface to an altitude of about 8 km at the poles and 16 km at the equator. What is called this lowest zone?

[A].	Stratosphere	[B].	Aerosphere
[C].	Troposphere	[D].	Ionosphere

Answer: Option C

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