The fate of water carried by subducted slabs to the deep Earth remains unclear. Experiments suggest that water is unlikely to escape the slabs when they reach the core–mantle boundary despite high pressures and temperatures.
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Deschamps, F. Deep mantle water prefers slabs. Nat. Geosci. 17, 590–591 (2024). https://doi.org/10.1038/s41561-024-01468-4
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DOI: https://doi.org/10.1038/s41561-024-01468-4