The model suggests “mantle rain” from inside Earth’s mantle ensures we will always have a surface ocean.
Hidden inside the Earth—within the first several hundred kilometers below the crust—there is another ocean. It is, most likely,. This water is not sloshing around in a big pool. No fish plumb its depths. In fact, this ocean is only water in the loosest sense: broken into its composite hydrogen and oxygen atoms and chemically bound to the surrounding rock, this ocean is in storage. Or, most of it is.
stable over billions of years. According to previous studies of the mantle, however, it could have been very different. Estimates based on previously understood mechanics of the deep water cycle suggest that nearly twice as much water is carried into the mantle as is released back to the surface. “The melt is like a slurry,” says Andrault. “Imagine a mushy mix of sand grains glued to each other with mud in between—the mud is the mantle rain.”
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