The zone of rocks just outside Earth's core could hold enough water to fill the oceans five times. That's the indication from an analysis of minerals created in the laboratory under conditions that simulate those deep within the planet.
Scientists believe that Earth's core is primarily iron with a smattering of silicon (SN: 1/12/02, p. 22: Earth's inner core could include silicon). The lower portion of Earth's mantle–the layer of hot, viscous rocks between the core and the cooler crust–is thought to be made up mostly of silicate minerals, which include silicon and oxygen.
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