How much of earth's atmosphere is made how much of earth's atmosphere is made up of nitrogen and oxygen? a. 50 percent b. between 25 and 75 percent c. less than 1 percent d. close to 99 percent of nitrogen and oxygen? a. 50 percent b. between 25 and 75 percent c. less than 1 percent d. close to 99 percent

How much of Earth's atmosphere is made up of nitrogen and oxygen?

  A. Close to 99 percent

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ANSWER

of the Earth's atmosphere is made up of nitrogen and oxygen.

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Oxygen makes up about 21% of Earth's atmosphere, and nitrogen makes up about 78%. Together, the two make up approximately 99% of the atmosphere.