Everyday Science
NULL
Medium
Question
Carbon dioxide in the atmosphere, by volume, is _______?
A
0.00039
✓ Official correct answer
B
0.039
C
0.13
D
0.3
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
0.00039
No member explanations yet for this option.
B
0.039
No member explanations yet for this option.
C
0.13
No member explanations yet for this option.
D
0.3
No member explanations yet for this option.
Explanation
According to the keyed exam answer, CO₂ is about 0.00039 by volume (~390 ppm).
Editor note: atmospheric CO₂ has increased since older textbooks; options left unchanged.
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