What is the third by volume, after nitrogen and oxygen, component of dry air?

carbon dioxide
methane
ozone
argon
Argon makes up 0.934% of the earth's atmosphere. It is more than twice as abundant as water vapor and 23 times as abundant as carbon dioxide.
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Answers by country

carbon dioxide
methane
ozone
argon
answers
flagthe United States
40%
7%
11%
40%
27
flagIndia
34%
14%
14%
36%
47
flagPoland
52%
3%
18%
24%
3535
flagthe United Kingdom
50%
16%
11%
22%
18
flagGermany
27%
18%
36%
18%
11