Diamonds reveal sign of the deepest water known inside Earth
A type of ice crystal in gems points to liquid existing up to 800 kilometers below the surface
COMPACT CUBE Researchers discovered ice-VII entombed within a diamond. Found only in very high pressure environments, such as those deep in Earth's interior, ice-VII's compact form consists of cubic lattices of hydrogen atoms (in red) and oxygen atoms (in blue). As the pressure changes, the orientation of the hydrogen atoms can shift; this diagram shows several possible hydrogen arrangements for each molecule.
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