The universe is a really amazing place. Who would have thought that the mantle would be a water reservoir and contribute to the Earth’s water cycle? That is what some scientists recently suggested in a Science article. If I understand it, the article does not say that there are oceans in the mantle, rather that water is mixed with the molten rock which descends into the mantle (and which comes up).
It can be found at http://www.sciencemag.org/content/344/6189/1265
For my own projects I have started studying a bit of geophysics recently, so expect another geophysics related post.
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