Giant blobs in Earth’s mantle may be driving a ‘diamond factory’

The boundary zone between Earth’s molten metal core and the mantle, its rocky middle layer, might be a diamond factory.

A new laboratory experiment finds that, under extreme temperatures and pressures, the combination of iron, carbon and water — all potential ingredients found at the core-mantle boundary — can form diamond. If this process also happens deep inside Earthit might explain some weird quirks of the mantle, including why it has more carbon in it than scientists expect.

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