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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.
Aside from Mauna Loa's arguable topographic effects on Iselle, there is another potential impact of volcanoes to consider. Active volcanoes can sometimes affect weatherand climateby discharging gases and particles into the atmosphere.The three dominant gases emitted by volcanoes are water vapor (about 90%), carbon dioxide, and sulfur dioxide. Both water vapor and carbon dioxide are important greenhouse gases.Greenhouse refers to the fact that these gases trap solar radiation.he 1991 Mount Pinatubo eruption (http://pubs.usgs.gov/pinatubo/hoblitt2/index.html) created what is thought to be the largest stratospheric sulfur dioxide injection of the 20th century. For three years following the eruption, the earth's surface cooled by as much as 1.3 degrees Celsius (2.3 degrees Fahrenheit).