Earth's rocky mantle and solid inner core are separated by the 2,300-kilometre-deep layer of molten iron that constitutes the outer core. Yet the sluggish pattern of mantle convection creates structure in the inner core.
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Lister, J. Structuring the inner core. Nature 454, 701–702 (2008). https://doi.org/10.1038/454701a
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DOI: https://doi.org/10.1038/454701a
