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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.
The beginning of a volcano. A volcano begins as magma, melted rock inside the earth, Magma results from the extreme heat of the earth's interior. The eruption of a volcano. The gas filled magma in the reservoir is under great pressure from the weight of the solid rock around it.This pressure causes the magma to blast or melt a conduit (channel) in a fracture, or weakened part of the rock. The magma moves up through the conduit to the surface.he beginning of a volcano. A volcano begins as magma, melted rock inside the earth, Magma results from the extreme heat of the earth's interior. The eruption of a volcano. The gas filled magma in the reservoir is under great pressure from the weight of the solid rock around it.