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Q: Much of the oxygen that is found in the atmosphere comes from?
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What planet has a nitrogen- oxygen atmosphere?

Earths atmosphere is rich in Oxygen, some 21% of the air is Oxygen. There is oxygen on other planets, but the percentage comes nowhere close to this. The percentage of Oxygen in earths atmosphere is thought to have been much higher in the past, before animals were about, but after the arrival of plants.


How much of the air oxygen?

21% of the atmosphere is oxygen.


How much of the atmosphere does oxygen take up?

21%


How much is the earth atmosphere is made up of nitrogen and oxygen?

The earths atmosphere is made up of 78% nitrogen and 21% oxygen


How much of the earths atmosphere is made up of nitrogen and oxygen?

The earths atmosphere is made up of 78% nitrogen and 21% oxygen


How much of the atmosphere of the is free of nitrogen?

32% the of the atmosphere is Argon, Oxygen and Other stuff


How much percent of oxygen gas is in the atmosphere?

20.946% by volum.


How much of earth's atmosphere is composed of nitrogen gas?

The earths atmosphere is made up of 78% nitrogen and 21% oxygen


What component of the earths atmosphere exists as a result of photosynthesis?

Photosynthesis converts carbon dioxide into oxygen. Therefore, much of the oxygen in our atmosphere is present due to photosynthesis.


Why cant you have an atmosphere made up of pure oxygen?

Because too much oxygen is harmful to the environment.


How much percentage of oxygen are there in the atmosphere?

Close to 21%, near 20.95%.


How much oxygen is in the worlds atmosphere?

Total mass of the atmosphere is about 5.5 quadrillion tons, of which oxygen is close to 20%, or 1.1 quadrillion tons. 1.1e+15 tons.