The Great Oxidation Event: How Oxygen Almost Wiped Out Early Life on Earth
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The Great Oxidation Event: How Oxygen Almost Wiped Out Early L…
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Imagine an Earth where oxygen was poison. That was our planet for its first two billion years! Around 2.5 billion years ago, the entire atmospheric composition changed forever, thanks to one incredible microorganism: cyanobacteria. Cyanobacteria evolved photosynthesis, the process of using sunlight, water, and $text{CO}_2$ to create energy, releasing pure oxygen ($text{O}_2$) as a waste product. Initially, this $text{O}_2$ was captured by iron in the oceans, forming vast deposits known as Banded
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Imagine an Earth where oxygen was poison. That was our planet for it…
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Known as the Great Oxidation Event, this was not a sudden catastrophe but a planetary transformation lasting hundreds of millions of years. The oxygen produced by these ancient microbes reacted with iron dissolved in the oceans, creating the banded iron formations we see in rocks today. This process likely triggered a 'Snowball Earth' – a global glaciation – as oxygen removed methane, a potent greenhouse gas, from the atmosphere. While it caused a die-off of anaerobic life that couldn't adapt, i
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