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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.
Category: Volcanoes grow by intrusion and extrusion. An intrusion is magma that moves up into a volcano without erupting. Like a balloon, this causes the volcano grows on the inside. An extrusion is an eruption of material that causes the volcano to grow on the outside.Volcanoes are constructed this way mainly of two materials: lava and ash. Another kind of volcano is called either a stratovolcano or composite-volcano. Mt. St. Helens, Pinatubo, and Fuji are all stratovolcanoes.n intrusion is magma that moves up into a volcano without erupting. Like a balloon, this causes the volcano grows on the inside. An extrusion is an eruption of material that causes the volcano to grow on the outside.