alleryThe atmosphere consists mainly of nitrogen and:
AKrypton
BAmmonia
COxygen
DMethane
Answer & Solution
Correct answer: C. Oxygen
1. Two gases together make up almost all of the air.
2. The rest is argon, carbon dioxide and water vapour.
3. The air is mainly nitrogen and oxygen.
4. So the answer is oxygen.
_Source: syllabus Science, Ch 13 'Earth as a System: Energy, Matter, and Life'_
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