. How much of Earth's atmosphere is made up of nitrogen and oxygen?
A. Close to 99 percent
B. 100 percent
C. Less than 1 percent
D. Between 25 and 75 percent
The Earth's atmosphere has 78% nitrogen. While the percentage of oxygen is 21%. Together the percentage is about 99%. So the answer will be : Close to 99 Percent.
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Asked 5/26/2014 8:48:34 AM
Updated 5/26/2014 9:18:14 AM
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