The indications are that a solid ball of iron lies at Earth's centre. But only the identification of an elusive seismic signature can confirm the long-standing assumption that it is indeed solid.
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Creager, K. Solid evidence in the inner core. Nature 454, 833–835 (2008). https://doi.org/10.1038/454833a
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DOI: https://doi.org/10.1038/454833a
