Discussion
Ninety-nine per cent of the mass of the earth’s atmosphere is confined to a height of
Answer: B
Ninety-nine per cent of the atmosphere's mass lies within 32 km of the surface.
Air is compressible, so it is densest at the bottom: about half the total mass lies below 5.5 km. The atmosphere has no sharp upper limit, thinning gradually into space beyond 10,000 km.
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