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Geography 8 Online
OpenStudy (anonymous):

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

OpenStudy (anonymous):

79% nitrogen, 20% oxygen, and 1% other gases

OpenStudy (anonymous):

The earth atmosphere is made up of 78% nitrogen and 20% oxygen.

rebeccaxhawaii (rebeccaxhawaii):

WELCOME TO OS any ideas?

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