Getting to the bottom of events at the boundary between Earth's core and mantle is fiendishly difficult. The latest analysis invokes evidence from an isotope of tungsten to conclude that the two do not interact.
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Hauri, E. Keeping score on the core. Nature 427, 207–208 (2004). https://doi.org/10.1038/427207a
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DOI: https://doi.org/10.1038/427207a
