Gases in the Atmosphere

 The atmospheric composition of gas on Earth is largely conducted by the by-products of the life that it nurtures.


Dry air from earth’s atmosphere contains 0.038% of carbon dioxide, 20.95% of oxygen, 78.08% of nitrogen and 0.93% of argon.

Traces of hydrogen, neon, helium, nitrous oxide, ozone and other “noble” gases, but generally a variable amount of water vapour is also present, on average about 1% at sea level.

The earth’s atmosphere doesn’t end at a specific place. The higher we go, the thinner the atmosphere gets. There is no clear distinction between the atmosphere and outer space. 75% of the atmosphere is within 11 kilometres of the Earth’s surface.




The process of gases in the Earth’s atmosphere trapping the Sun’s heat is known as the greenhouse effect. Due to this process, the Earth is much warmer than it would be without an atmosphere. The greenhouse effect is one of the things that makes Earth a comfortable place to live.

The stratosphere contains the ozone layer. The stratospheric ozone layer absorbs most of the sun’s ultraviolet light and thereby protects the earth.

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