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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 Gas. During an eruption of a volcano, gases dissolved in the magma are released into the air. These gases can escape through many different places in the volcano, such as the large opening at the top or vents in the side.