my_script.py

Created by laurahenriet4

Created on December 08, 2023

762 Bytes



4,6 milliard année( crea terre)
athmo primi 
bombardement meteorites et degazement manteaux 
80% H2O 15%CO2 5%N2 
athmo actuel 
21% O2 78% N2 
diminution H20 et CO2 
apparition O2 
diminution H20 = diminution temp et pression 
= condensation eau 
hydroshpere = developpement de la vie 
ion Fe2+ cause erison des continents 
Fe2+ dans l'eau va dans les stromatilites 
ca s'oxyde degage O2 
ocean sature de O2 et degage O2 dans athmo 
3,5 milliard année = appaition O2 
2,4 milliard = o2 dans athmo 
6C02+CH2O->(soleil et chlorophylle)
C6H12O6+6O2

formation océans=vapeur condensée par le refroidssiement de la T
apparition vie=premieres traces->stromatolites 3,5 Ga
->§par photosynthèse, ont augmenté le dioxygène de l'atm il y a 2,4 Ga

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