Subducting oceanic crust is sometimes observed to stagnate in the lower mantle. Laboratory experiments show that high pressures in the deep Earth may strengthen mantle rocks, increasing their viscosity and halting the sinking slabs.
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Cordier, P. Strength under pressure. Nature Geosci 8, 255–256 (2015). https://doi.org/10.1038/ngeo2402
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DOI: https://doi.org/10.1038/ngeo2402
