Experimental data reveal that Earth’s mantle melts more readily than previously thought, and may have remained mushy until two to three billion years ago.
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Parman, S. An Archaean mushy mantle. Nature Geosci 11, 85–86 (2018). https://doi.org/10.1038/s41561-018-0060-5
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DOI: https://doi.org/10.1038/s41561-018-0060-5