Each continent contains pockets of ancient crust that appear to have been unaffected by tectonic forces since they formed billions of years ago. Why? There's now a fresh twist on the usual explanation.
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Nyblade, A. Hard-cored continents. Nature 411, 38–39 (2001). https://doi.org/10.1038/35075198
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DOI: https://doi.org/10.1038/35075198