By volume, which of the following comprises most of Earth's atmosphere?
A) carbon monoxide
B) chlorofluorocarbons
C) ozone
D) carbon dioxide
E) argon

Question

Quizplus · Accepted Answer

Argon makes up 0.934% of the Earth's atmosphere by volume, making it the most abundant gas after nitrogen and oxygen. The other choices - carbon monoxide, chlorofluorocarbons, ozone, and carbon dioxide - make up only negligible amounts of the atmosphere by volume.

By Volume, Which of the Following Comprises Most of Earth's