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13 cards from this deck
2.7 billion years ago
Photosynthesis
Decreased (went down)
Increased (went up)
Carbon dioxide
Oxygen
6CO2+6H2O→C6H12O6+6O26CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_26CO2+6H2O→C6H12O6+6O2
Once there was enough oxygen in the atmosphere
Coal
Crude oil and natural gas
It dissolves
Making shells and skeletons
Limestone
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