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These are the concentrations of gasses in the atomosphere:

Nitrogen------78.08%

Oxygen------20.95%

Water------0 to 4%

Argon--------0.93%

Carbon Dioxide------0.036%

Neon-----0.0018%

Helium----0.0005%

Methane--0.00017%

Hydrogen--0.00005%

Nitrous Oxide--0.00003%

Ozone--0.00004%

However the higher you go in the atmosphere the higher the concentration of oxygen.

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Q: What part of the earth is mostly oxygen by volume?
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