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What is the major constituent of the atmosphere of Mars?

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What is the major constituent of the atmosphere of Mars?

What is the major constituent of the atmosphere of Mars?
A) CO2 (carbon dioxide) C) H2O (water vapor)
B) CH4 (methane or natural gas) D) H2 (hydrogen)

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Discovering the Universe

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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