alleryWhich gas makes up about 78 percent of Earth's atmosphere?
APure oxygen
BNitrogen gas
CCarbon dioxide
DHydrogen gas
Answer & Solution
Correct answer: B. Nitrogen gas
1. Earth's air is mostly two gases.
2. Nitrogen makes up 78 percent and oxygen 21 percent.
3. Carbon dioxide and hydrogen are only minor parts.
_Source: Wikipedia, Solar System, Inner planets_
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