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Fossil fuels such as coal, petroleum and natural gas are formed mainly by the:
AAnaerobic decomposition of buried dead organisms
BRapid burning of standing forest biomass each decade
CSlow cooling of molten lava deep within the earth's core
DEvaporation of seawater leaving behind mineral deposits
Answer & Solution
Correct answer: A. Anaerobic decomposition of buried dead organisms
1. Fossil fuels are energy-rich substances inside the earth's crust.
2. They form by anaerobic decomposition of buried dead organisms over millions of years under heat and pressure.
3. Options B, C and D describe unrelated processes, not fossil-fuel formation.
4. Hence the answer is A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Environmental Management", p.325_
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