Which pair of gases are most abundant within Earth's modern atmosphere?
A)nitrogen and oxygen
B)hydrogen and helium
C)carbon dioxide and methane
D)water vapor and sulfur dioxide

Name: Which pair of gases are most abundant within Earth's modern atmosphere? A)nitrogen and oxygen B)hydrogen and helium C)carbon dioxide and methane D)water vapor and sulfur dioxide
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Question

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Nitrogen and oxygen make up approximately 99% of Earth's modern atmosphere, with nitrogen making up about 78% and oxygen making up about 21%.

Which Pair of Gases Are Most Abundant Within Earth's Modern