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vulcanism

vulcanism
1. A theory of the 18th and 19th centuries, based initially on fieldwork in the French Auvergne and associated with Nicolas Desmarest and James Hall. They proposed that volcanic rocks were produced from molten material, and that volcanoes had formerly existed where basalts, etc. are now present.

2. See VOLCANICITY.

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volcanism

volcanism (vulcanism) Volcanic activity. The term includes all aspects of the process: the eruption of molten and gaseous matter from volcanoes, the building up of cones and mountains, and the formation of lava flows, geysers and hot springs.

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Volcanism

Volcanism See VOLCANICITY.

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