Nitrogen
Carbon dioxide
Troposphere
Stratosphere
Termosphere
21%. Plants produce it. It is necessary for combustion and respiration.
Mesosphere
Argon
Water vapour
78%. It has no colour, no smell and no taste.
0,03%. It has no colour or smell, is also produced by plant and animal respiration. Essential for photosynthesis.
Ozone
0,97%. It comes from the evaporation of oceans, lakes and rivers and also from plant transpiration.
Oxygen