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Evolution of the Earth's Atmosphere

Question

State the rough composition of the atmosphere today.

3 years ago

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Russel Nitzsche


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The composition of the Earth’s atmosphere (as dry air, because it contains varying amounts of water), is roughly 78% nitrogen, 21% oxygen. The remaining 1%, is composed of about 0.9% argon (the most common noble gas). The other noble gases, (i.e. helium, neon, krypton, xenon and radon), together with other gases make up the remaining 0.1%. Note, carbon dioxide currently makes up just 0.04% of the atmosphere, but its level is rising. (It has risen from 0.029% to 0.040% in the last 100 years, that is a rise of 27.5%. A rise in the Earth’s average temperature in the same period of >1 deg C, gives evidence of global warming by the Greenhouse Effect.)


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In our atmosphere today, there are the following gases:

Nitrogen ( ~ 78%)

Oxygen ( ~ 21)

Carbon dioxide, Water Vapour & Noble Gases (in total 1%)


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Adelina Madjarova

78% Nitrogen, 21% Oxygen, 1% other gases

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