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99 per cent of the atmosphere's mass lies within what height of the earth's surface?
A32 km
B120 km
C90 km
D8 km
Answer & Solution
Correct answer: A. 32 km
1. Air is part of the earth's mass.
2. 99 per cent lies within 32 km.
3. Air is felt only when it blows as wind.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 8, Composition and Structure of Atmosphere._
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