What elements, besides iron, make up Earth's core? Discrepancies in the isotopic ratios found in rocks from Earth's mantle and in undisturbed meteoritic material indicate strongly that one answer is silicon.
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Elliott, T. Silicon-enhanced core. Nature 447, 1060–1061 (2007). https://doi.org/10.1038/4471060a
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DOI: https://doi.org/10.1038/4471060a
