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What Percentage Of The Earth's Atmosphere Is Oxygen?

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Adarsh Pandey answered
Earth's atmosphere is a mixture of different gases.It has varied gases like Oxygen,Nitrogen,Carbon-di-oxide,Noble Gases,Water Vapours.....
1.Nitrogen is 78%
2.Oxygen is 21%
3.Carbon-Di-Oxide is 0.003%
4.Noble Gases,Water Vapours and others(NO,CO...)make the remaining.
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Anonymous answered
The amount of oxygen on earth is uncountable because oxygen is produced without stopping so the amount of oxygen would go bumping up high per nanosecond
By: Science professor from University of Alberta

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