Hunting the Hidden Oceans
July 12, 2018 8:14 PM Subscribe
Water-bearing minerals reveal that Earth’s mantle could hold more water than all its oceans. So . . . where it did come from? These fragments of crystalline carbon are every bit as precious — not for the diamond itself, but for what is locked inside: specks of minerals forged hundreds of kilometers underground, deep in Earth’s mantle. Not actual drops of water, or even molecules of H20, but its ingredients, atoms of hydrogen and oxygen embedded in the crystal structure of the mineral itself. This hydrous mineral isn’t wet. But when it melts, out spills water. And still the question remains, where did it come from?