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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.
Volcanologists also use a device called a spectrometer to measure how the gases being emitted by the volcano affect the light. Based on the light above a gas vent, they can tell if the volcano is emitting hydrogen sulfide or carbon and sulfur.he most basic tool used by any volcanologist is a simple rock hammer, used for breaking off samples of igneous rock for laboratory analysis. Other samples are collected from the volcano's core using a drill.