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_________________?
Correct answer: B. Troposphere
- A. Ionosphere
- B. Troposphere
- C. Stratosphere
- D. None of these
Explanation
The troposphere is the lowest atmospheric layer and contains most of the atmosphere's mass because air density decreases rapidly with altitude. The stratosphere lies above it, while the ionosphere is a much higher region.
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