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Petrologists who recreated hot, high-pressure conditions from 60 miles below Earth’s surface have found a new clue about a crucial event in the planet’s deep past. Their study describes how fossilized carbon--the remains of Earth’s earliest single-celled creatures--could have been subsumed and locked deep in Earth’s interior starting around 2.
4 billion years ago--a time when atmospheric oxygen rose dramatically.Image credit: ISS Expedition 7 Crew, EOL, NASA
