Author Question: The Great Oxygen Event marks the time, approximately 2.5 billion years ago, when ________. (Read 69 times)

mpobi80 · **on:** Feb 28, 2020

The Great Oxygen Event marks the time, approximately 2.5 billion years ago, when ________.
◦ photosynthesis was clearly established and producing oxygen
◦ there was significant oxygen in the atmosphere
◦ there was enough oxygen in the atmosphere to support a major burst of life on Earth
◦ there was a massive volcanic eruption that lead to a very rapid increase in oxygen levels on Earth
◦ there was a cataclysmic weather event that absorbed most of the oxygen in the atmosphere and locked it into iron deposits in the oceans

pocatato · **Reply #1 on:** Feb 28, 2020

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