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What two gases together make up 99% of Earth's atmosphere?
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What two gases together make up 99% of Earth's atmosphere?

User Emil M
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nitrogen, oxygen, water vapor, carbon dioxide,methane, nitrous oxide,
User Simulacre
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The two gasses that make up 99% of the earth's atmosphere are nitrogen and oxygen.
Hope that helped! =)
User Utku Dalmaz
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