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Giant blobs in Earth’s mantle may be driving a ‘diamond factory’ near our planet’s core

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 Earth, it might explain some weird quirks of the mantle, including why it has more carbon in it than scientists expect. 

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