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The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the | |
A. | ionosphere [Wrong Answer] |
B. | troposphere [Correct Answer] |
C. | stratosphere [Wrong Answer] |
D. | none of these [Wrong Answer] |