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How often does oxygen cycle through the atmosphere? a. about every 1000 years b. about every 1500 years c. about every 2000 years d. about every 2500 years
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How often does oxygen cycle through the atmosphere?

a. about every 1000 years
b. about every 1500 years
c. about every 2000 years
d. about every 2500 years

User Damodar
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2 Answers

5 votes

B. about every 2000 years


User Ddomingo
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6.6k points
6 votes
about every 2000 years.

User AbdealiLoKo
by
7.5k points
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