The branch of geology that deals with volcanism and the processes involved in magma flow and eruption through a vent in the earth's surface.
This category is also used for vulcanology.

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Geologic map of the Wrangell-Saint Elias National Park and Preserve, Alaska

Reconnaissance geologic map of the largest National Park in the US. Map area includes high mountains, active and ancient volcanoes, expansive ice fields, and alpine and tidewater glaciers. Kennecott Mine, a world-class copper deposit is located in the p