There could be more water trapped in a rocky layer of Earth's mantle than exists in all the oceans, according to a new study published in the journal Science. The water, which is between 250 and 410 miles below the surface, does not exist in liquid, ice or vapor forms like we're used to. It's trapped inside the molecular structure of minerals called ringwoodite and wadsleyite. "It's no longer liquid water that we're talking about at these great depths. The weight of hundreds of kilometers of rock and very high temperatures above 1,000 degrees Celsius (1,832 Fahrenheit) break down water into its components," Northwestern University geophysicist Steve Jacobsen said Friday.

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