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No - Nitrogen is the largest quantity of gas in the atmosphere at 79% - followed by Oxygen at 20%. Carbon dioxide and other minute quantities of inert gasses make up just 1% of the total volume.

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13y ago
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10y ago

No. Oxygen is the second most abundant. Carbon dioxide is the fifth most abundant gas overall after nitrogen, oxygen, argon, and water vapor*.

*This is based on the average abundance of water vapor. The actual abundance varies greatly depending on location and weather conditions.

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10y ago

No, the two most abundant gases are nitrogen and oxygen.

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10y ago

No, nitrogen is the most abundant gas. Next after that is oxygen. Carbon dioxide makes up about 0.04% of the atmosphere, up from 0.028% 200 years ago.

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Q: Is it true that the second most abundant gas in the Earth's atmosphere is carbon dioxide?
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