The most abundant gas in the Earth's atmosphere is nitrogen. It makes up about 78% of the atmosphere by volume. Oxygen is the second most abundant gas, making up about 21% of the atmosphere. Other gases such as argon, carbon dioxide, neon, helium, and methane make up the remaining 1%.
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Answer:
Nitrogen.
Explanation:
The most abundant gas in the Earth's atmosphere is nitrogen. It makes up about 78% of the atmosphere by volume. Oxygen is the second most abundant gas, making up about 21% of the atmosphere. Other gases such as argon, carbon dioxide, neon, helium, and methane make up the remaining 1%.
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