atmosphere-ocean oxygenation
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![Great Oxidation Event 2.5 Billion Years Ago Lasted for Over 200 Million Years, Longer Than Previously Thought [Study]](https://1471793142.rsc.cdn77.org/data/images/full/70831/great-oxidation-event-2-5-billion-years-ago-lasted-for-over-200-million-years-longer-than-previously-thought-study.jpg?w=586&h=336)
Great Oxidation Event 2.5 Billion Years Ago Lasted for Over 200 Million Years, Longer Than Previously Thought [Study]
The Great Oxidation Event was a period when Earth’s first extinction event took place, killing most anaerobic life. Click to read more.
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