alleryWhich gas is produced in the largest quantity by anaerobic decomposition of organic waste in landfills?
AHelium
BOxygen
CMethane
DArgon
Answer & Solution
Correct answer: C. Methane
1. When organic waste decomposes without oxygen, microbes produce methane (CH₄).
2. Methane is a powerful greenhouse gas.
3. Landfill methane capture can reduce climate impact and produce fuel.
_Source: syllabus Science, Ch 13 "Our Environment", §13.2.2_
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