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GeoWord of the Day

The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.

Today's GeoWord

volcano (vol-ca'-no)  (a) A vent in the surface of the Earth through which magma and associated gases and ash erupt; also, the form or structure, usually conical, that is produced by the ejected material. (b) Any eruption of material, e.g. mud, that resembles a magmatic volcano. Obsolete var: vulcano. Pl: volcanoes. Etymol: the Roman deity of fire, Vulcan.

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