Conditions in Earth's mantle can be inferred from seismic-wave velocities which reveal areas of anisotropy. Evidence emerges of such an area at mid-mantle level, associated with a subducting tectonic plate.
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Fischer, K. Flow and fabric deep down. Nature 415, 745–747 (2002). https://doi.org/10.1038/415745a
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DOI: https://doi.org/10.1038/415745a