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Researchers haven’t been sure exactly what drives this rifting, but a new study in Nature Geoscience suggests it is caused by rhythmic pulses of molten rock from deep below the surface.—Nora Bradford, Scientific American, 7 July 2025 That involves a narrow escape from its fiery vat of molten steel.—Peter Balonon-Rosen, Vox, 4 July 2025 Instead, these changes are announced millions of years before they’re actually achieved, by the activity of molten rock in Earth’s mantle.—Sam Walters, Discover Magazine, 25 June 2025 As parts of the colliding plates and seafloor are pushed into Earth’s mantle, blobs of molten rock rise upwards and come into contact with water and gases, resulting in highly-explosive mix on the surface.—David Bressan, Forbes.com, 20 June 2025 See All Example Sentences for molten
Word History
Etymology
Middle English, from past participle of melten to melt
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