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Question

What are the two main constituents of atmospheric air?

A
Oxygen and Carbondioxide
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B
Nitrogen and Carbondioxide
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C
Oxygen and Nitrogen
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D
Oxygen and Hydrogen
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Solution

The correct option is C Oxygen and Nitrogen
Earth's atmosphere is made up of a combination of gases, mainly nitrogen and oxygen. The major components of nitrogen, oxygen and argon remain constant over time and space, while trace components like CO2 and water vapor vary considerably over both space and time.

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