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Chemistry 7 Online
OpenStudy (anonymous):

Earth's atmosphere is mainly composed of nitrogen, oxygen, carbon dioxide, and water vapor. So, Earth's atmosphere can be described as... A.a nonmetallic molecule. B.a mixture of gases. C.a solution of elements. D.a chemical compound.

OpenStudy (chmvijay):

nitrogen, oxygen, carbon dioxide, and water vapor are mixtures of gases

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