Earth's oxygen-rich atmosphere may owe its existence to cold subduction

PHYSorg
May 27, 2026, 12:15 pm45 pts
Earth was mostly devoid of oxygen for much of its 4.5 billion year lifetime. That is, until certain processes started to allow for the eventual buildup of oxygen up to the levels we have now (around 21% of the atmosphere). While scientists have found evidence of the approximate timescales of rises in oxygen…

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