Extraction of the continental crust has left the Earth's mantle depleted in certain elements. Some rocks from the Arctic Ocean floor suggest that the extent of depletion and heterogeneity in the Earth's mantle may be greater than we thought.
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Stracke, A. Tracking mantle depletion. Nature Geosci 1, 215–216 (2008). https://doi.org/10.1038/ngeo163
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DOI: https://doi.org/10.1038/ngeo163
