Composition of the atmosphere are mainly nitrogen, accounting for 78.1%; oxygen 20.9%; argon gas accounted for 0.93%; there is a small amount of carbon dioxide, rare gases (helium, neon, argon, krypton gas, xenon gas radon gas) and water vapor.
4 common gases in the atmosphere is oxygen, nitrogen, carbon dioxide and water.
Oxygen, nitrogen, carbon dioxide and water vapor.