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A hundred and fifty years ago, in "Journey to the Centre of the Earth," French science fiction writer Jules Verne pictured a vast sea that lay deep under our planet's surface.Writing in the journal Nature, scientists said Wednesday that they had found an elusive mineral pointing to the existence of a vast reservoir deep in the Earth's mantle, 400-600 kilometers beneath our feet. It may hold as much water as all the planet's oceans combined, they believe.Analysis shows that a whopping 1.5 percent of the rock comprises molecules of water.Scientists have debated for decades about whether the transition zone has any water, and if so, how much of the precious stuff there might be.The geologist also said the water was likely to be locked up in specific rocks, in a molecular form called hydroxyl.
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