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The troposphere is the only layer supporting life largely because it holds about:
A25 per cent of atmospheric gases
B75 per cent of atmospheric gases
C50 per cent of atmospheric gases
D95 per cent of atmospheric gases
Answer & Solution
Correct answer: B. 75 per cent of atmospheric gases
1. The atmosphere is a thin envelope of gases held above the Earth by gravity.
2. Those gases are not spread evenly through its full height.
3. About 75 per cent of them sit in the troposphere, along with dust and water vapour.
4. That concentration is what makes the layer breathable and able to support living things.
5. It is also why all weather elements occur there rather than in the layers above.
_Source: NECTA ACSEE 2023 Geography 113/1, Question 6: Position, Behaviours and Structure of the Earth_
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