What was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere as we have today?
Meteor impacts
Volcanic gases
Earthquakes
Photosynethic bacteria (Cyanobacteria)
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Home » Chemistry » What was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere as we have today? Meteor impacts Volcanic gases Earthquakes Photosynethic bacteria (Cyanobacteria)