Oxygen reached Earth’s mantle a billion years before the Great Oxidation Event, new study finds
Researchers at the University of Portsmouth examined ancient minerals to trace how oxygen levels changed between 3.4 billion and 2.1 billion years ago.
New Delhi: Billions of years ago, when oxygen first appeared on Earth, the atmosphere was not the only part of the planet undergoing radical change. The Earth’s depths were also responding to the changes, says a new study, which offers fresh clues ab... [3578 chars]
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