Drilling deep to study the oxygenation of Earth
Planetary Health

Drilling deep to study the oxygenation of Earth

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Some 2.3 to 2.4 billion years ago, Earth underwent a monumental transformation that forever altered the planet’s course. Cyanobacteria evolved a new kind of photosynthesis that unleashed tremendous amounts of oxygen into the oceans and atmosphere, setting the stage for life as we know it.

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