The Archaean Earth was much hotter than today. Numerical modelling shows that the base of thickened crust that formed at the time would have been so dense that it dripped back into the mantle.
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Herzberg, C. Archaean drips. Nature Geosci 7, 7–8 (2014). https://doi.org/10.1038/ngeo2033
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DOI: https://doi.org/10.1038/ngeo2033
