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Volcanism is the eruption of molten rock (magma) onto the surface of a planet. A volcano is the vent through which magma and gases are discharged.Magma that reaches the surface is called âlava.â Volcanos are named for Vulcan â the Roman god of fire!olcanism is the eruption of molten rock (magma) onto the surface of a planet. A volcano is the vent through which magma and gases are discharged.
Much of the carbon dioxide released by volcanoes is emitted by degassing of subterranean magma when the volcano is not erupting. In this photo, volcanic gases and steam rise from Mount Merapi, Indonesia, on May 20, 2012. Creative Commons license by Jimmy McIntyre.