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Stratospheric Pollution

"Stratospheri...

Question

"Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules, which make up ___ of the atmosphere."

A

21%

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B

22%

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C

23%

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D

24%

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Solution

The correct option is A 21%
The atmosphere is composed of $\approx$ 78% nitrogen and $\approx$ 21% oxygen, with small amounts of other gases. So, oxygen molecules make up 21% of the atmosphere.

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