Scientists uncover the 2.3-billion-year-old secret that helped keep Earth habitable - Science Daily
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More than 2 billion years ago, Earth underwent a dramatic transformation as oxygen began building up in its atmosphere. But that change left scientists with a major mystery: How did the planet maintain enough oxygen to remain habitable over millions of years?
Researchers have now uncovered evidence that the answer may lie in an ancient recycling system within Earth's oceans. By studying rocks from South Africa, they found that changes in ocean chemistry helped create a natural cycle in which biological activity supported the continued accumulation of atmospheric oxygen.
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