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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.
The gases associated with a volcanic eruption are initially dissolved in magma, which is hot molten rock found in the deeper layers of earth. During a volcanic eruption these gases are released into the atmosphere. The most abundant gas expelled during a volcanic eruption is water vapor.Water vapor can benefit the planet by adding water to the water cycle. However, it could also impact climate change.olcanic eruptions emit water vapor and toxic gases into the atmosphere. Learn about the gases emitted from an erupting volcano, such as carbon dioxide, sulfur dioxide, hydrogen sulfide, hydrochloric acid and carbon monoxide and their effects in this video lesson.