All vital atmospheric processes leading to various climatic and weather conditions take place in the :

A. Stratosphere
B. Troposphere
C. Ionosphere
D. Exosphere
Answer» B. Troposphere
Explanation: Troposphere, that extends up to a height of 12 km on an average from the surface of the earth, is the locale of all the vital atmospheric processes which create the climatic and weather conditions on the earth's surface. About half of the mass of air comprising the entire atmosphere is concentrated in this zone. This is the lowermost layer of the atmosphere.
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