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28 April, 02:29

3.

What two types of gas make up most of Earth's atmosphere?

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Answers (2)
  1. 28 April, 03:09
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    Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases.
  2. 28 April, 05:21
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    Nitrogen, oxygen
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