did we always have the ozone layer?



  1. 0 Votes

    No.  The ozone layer formed as a result of excess Oxygen in the atmosphere.  Early in the Earth’s history, all life was anaerobic.  Once photosynthesis became an important process, algae began uptaking Carbon Dioxide and emitting Oxygen.  The increasing Oxygen levels in the atmosphere and the cleaving of the Oxygen molecule by UV radiation in the upper atmosphere led to the formation of the ozone layer.

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