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Deep sea rocks suggest oxygen can be made without photosynthesis, deepening the mystery of life

By Lewis Alcott, Lecturer in Geochemistry, University of Bristol

Oxygen, the molecule that supports intelligent life as we know it, is largely made by plants. Whether underwater or on land, they do this by photosynthesising carbon dioxide. However, a recent study demonstrates that oxygen may be produced without the need for life at depths where light cannot reach.

The authors of a recent publication in Nature Geoscience were collecting samples from deep ocean sediments to determine the rate…

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