The Oxygen Cycle continued....

Some important equations for the early Earth's atmosphere (free oxygen production)

    H2O + hv -> OH + H

    H(atmos) ---heat---> H space

    OH + OH -> H20 + O

With photosynthesis the production of free oxygen is accelerated from:
    CO2 + H2O  ----sunlight---> 'CH2O' + O2

But energy can also be released from carbohydrates by respiration:
     'CH2O' + O2 -----> CO2 + H20 (+energy)
thus depleting free oxygen.


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