C 1.4 - The Atmosphere Today

Gases in the Earth's atmosphere today :

Nitrogen - 78%
Oxygen - 21%
Argon - 0.9%
Carbon Dioxide - 0.04%
other gases - traces
[there is also water vapour but that changes too much from day to day so it is not included]

Some of the other 1% gases are unreactive noble gases, mainly argon. A small amount of CO2 is found aswell (0.04%). There are also trace amounts of…