ringwoodite

(Newser) - Four hundred miles beneath the United States, there appears to be enough water to fill all our oceans—almost three times. Researchers have for the first time discovered direct evidence of the water, which exists as a fourth form: not liquid, not ice, not vapor, but hydrogen and oxygen molecules...

(Newser) - A huge "wet zone" hundreds of miles beneath the surface of the Earth could hold as much water as all the oceans put together, according to researchers analyzing a mineral from deep in the mantle. The water is "not a Jules Verne-style ocean you can sail a boat...