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Volcanic activity and changes in Earth's mantle were key to rise of atmospheric oxygen - Phys.org
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Physorg
Washington · 2 months ago

Oxygen first accumulated in the Earth's atmosphere about 2.4 billion years ago, during the Great Oxidation Event. A long-standing puzzle has been that geologic clues suggest early bacteria were photosynthesizing and pumping out oxygen hundreds of millions of …

https://phys.org/news/2020-06-volcanic-earth-mantle-key-atmospheric.html
Physorg
Washington · 2 months ago
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