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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.
A volcano is a depositional mountain landform built up by the emission of hardened lava through a vent. The lava comes from a magma chamber deep underground. As the layers of hardened lava build up, the lava pours out from a crater at the top of the volcanic cone. 8.3-5 Name the three main types of volcanic emissions. Briefly describe or list the most common forms of each type.