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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.
Volcano. A volcano is a fissure or vent through which molten rock material, or magma, and gases from the interior of the earth erupt on to its surface, and the landform, which is produced as a result of this eruption.