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15 cards from this deck
2.7 billion years ago
Photosynthesis
Carbon dioxide (CO2CO_2CO2)
Oxygen (O2O_2O2)
Decreased (went down)
Increased (went up)
1 billion years
Dead plants
Dead sea creatures
Hydrocarbons
CO2CO_2CO2 dissolves in seawater
Making shells and skeletons
Limestone
Calcium carbonate
6CO2+6H2O→C6H12O6+6O26CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_26CO2+6H2O→C6H12O6+6O2
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