The volume of carbon dioxide has been rising in past decades mainly due to:
AVolcanic dust eruptions
BThe burning of fossil fuels
CFalling world ocean levels
DYearly meteor showers
Answer & Solution
Correct answer: B. The burning of fossil fuels
1. Most atmospheric gases hold a constant volume.
2. Carbon dioxide is the exception, rising for decades.
3. The main cause is the burning of fossil fuels.
_Source: NCERT Class 11 Geography, 'Composition and Structure of Atmosphere' (kegy207)_
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