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Oxygen becomes almost negligible at what height above the surface?
A50 km
B120 km
C32 km
D90 km
Answer & Solution
Correct answer: B. 120 km
1. Gas proportions change in higher layers.
2. Oxygen is negligible at 120 km.
3. Carbon dioxide and water vapour reach only 90 km.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 8, Composition and Structure of Atmosphere._
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