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21%
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
20.946% by volum.
Around 21%, or 1.1 quadrillion (1.1e+15) tons.
There was removal of trees. The oxygen supply declined and was of much poorer quality.
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.
21% of the atmosphere is oxygen.
21%
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
32% the of the atmosphere is Argon, Oxygen and Other stuff
20.946% by volum.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
Photosynthesis converts carbon dioxide into oxygen. Therefore, much of the oxygen in our atmosphere is present due to photosynthesis.
Because too much oxygen is harmful to the environment.
Close to 21%, near 20.95%.
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.