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HOW DID OXYGEN APPEAR IN EARTH’S ATMOSPHERE? #Science #Earth #Oxygen
For most of Earth’s history, free oxygen was almost absent from the atmosphere. More than 2.4 billion years ago, microorganisms capable of photosynthesis began releasing oxygen, triggering a planetary transformation known as the Great Oxidation Event. But oxygen did not accumulate immediately: at first, it reacted with enormous amounts of ...
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