The fate of water that enters the mantle within subducting slabs is unclear. Laboratory experiments indicate that subducted crust can transport large amounts of water into the deep Earth, and the lower mantle may become more hydrated over time.
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Nishi, M. Mantle hydration. Nature Geosci 8, 9–10 (2015). https://doi.org/10.1038/ngeo2326
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DOI: https://doi.org/10.1038/ngeo2326
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