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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.
Volcanic eruptions are caused when magma from the magma chamber of the Earth rises up the pipe and out of the vent.Magma is continuously supplied from the mantle of the Earth. Shield volcanoes usually have a gentle eruption, as it contains basic lava.nother type of eruption in what is known as a boiler volcano results from water that gets trapped inside porous rock, and is then heated by the mantle, until is turns into steam and the steam pressure causes the volcano to explode. These explosions can be extremely large.