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Rare diamond reveals existence of water deep inside Earth’s mantle

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This battered diamond has survived a “journey to hell and back,” and it has a pretty specular story to tell. Spat out from deep inside the earth, it is our first direct evidence for a scientific theory that says that vast amounts of water are trapped deep inside Earth’s mantle.

Discoverd by miners who thought it was worthless, the diamond could be key for our understanding of our planet.
via Gizmodo

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