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  • noun geology An upwelling of abnormally hot rock within the Earth's mantle.


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  • In a mantle plume, a jet of volcanic heat fuels a constant, massive outpouring of lava on the seafloor. Scientists think that a few dozen mantle plumes dot the planet, of which the Hawaiian Islands are the most famous example.
    Alexandra Witze & Jeff Kanipe, Island on Fire: The Extraordinary Story of a Forgotten Volcano That Changed the World (New York: Island Books, 2015), ch. 2, Kindle loc 509

    February 10, 2019