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Feed Science Daily: Life-giving Rocks From A Depth Of 250 Km (sciencedaily.com)

If our planet did not have the ability to store oxygen in the deep reaches of its mantle there would probably be no life on its surface. This is the conclusion reached by scientists who have subjected the mineral majorite to close laboratory examination. Majorite performs an important function as an oxygen reservoir. Near the Earth's surface the mineral breaks down, releasing oxygen, which then binds with hydrogen from the Earth's interior to form water.

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