Air density with increasing altitude:
AIncreases
BStays same
CDoubles up
DDecreases
Answer & Solution
Correct answer: D. Decreases
1. There is less air pressing down as you rise.
2. So the air spreads out.
3. Density decreases with increasing altitude.
4. So the answer is it decreases.
_Source: NCERT Class 11 Geography, 'Composition and Structure of Atmosphere'_
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