Ozone
Oxygen
Mesosphere
21%. Plants produce it. It is necessary for combustion and respiration.
Nitrogen
Stratosphere
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.
Water vapour
Troposphere
Carbon dioxide
Termosphere
Argon
0,97%. It comes from the evaporation of oceans, lakes and rivers and also from plant transpiration.
