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9 cards from this deck
Approx. 200 million years
Almost 80%
Nitrogen (N2N_2N2)
About 20%
Crucial for respiration
Gases present in proportions < 1%
Water vapour (H2OH_2OH2O), CO2CO_2CO2, noble gases (e.g. argon)
Climate regulation, greenhouse effect, chemical reactions
Remained relatively stable for 200 million years
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