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The molecular composition ofthe Earth'satmosphere is Nitrogen (N2

), 78.08%; Oxygen (O2

), 20.95%; Argon (A), 0.93%.

Water Vapor (H2

0), will range 0-4% depending on meteorological conditions. Carbon Dioxide (CO2

) is 0.038%.

Other inert gases such asNeon (Ne), Helium (He), and Krypton (Kr) to name a few, are found in verysmall amounts.

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Q: What three gases is the atmosphere primarily composed of?
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