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volcanism |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.07 sec. |
volcanismor vulcanismAny of various processes and phenomena associated with the surface discharge of molten rock or hot water and steam, including volcanoes, geysers, and fumaroles. Most active volcanoes occur where two plates converge and one overrides the other (see plate tectonics). Volcanism can also occur along the axis of an oceanic ridge, where the plates move apart and magma wells up from the mantle. A few volcanoes occur within plates, far from margins. Some of these are thought to occur as a plate moves over a “hot spot” from which magma can penetrate to the surface; others appear to result from an extremely slow form of plate spreading. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| I wonder if variations in undersea volcanism might have contributed to the sudden spike in Pacific Ocean surface temperatures during the Aptian epoch of the Cretaceous period. Epithermal mineralization includes gold and silver deposits associated with felsic volcanism in island and continental arcs. She created a project called "Petrology, Morphology and Geochemistry of the Southern Juan de Fuca Ridge: Evidence for Off-Axis Volcanism. |
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volcanism
