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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 gases were directly responsible for approximately 3% of all volcano-related deaths of humans between 1900 and 1986. Some volcanic gases kill by acidic corrosion; others kill by asphyxiation. The greenhouse gas, carbon dioxide, is emitted from volcanoes, accounting for nearly 1% of the annual global total.Some volcanic gases including sulfur dioxide, hydrogen chloride, hydrogen sulfide and hydrogen fluoride react with other atmospheric particles to form aerosols.he sources of volcanic gases on Earth include: 1  primordial and recycled constituents from the Earth's mantle, 2  assimilated constituents from the Earth's crust, 3  groundwater and the Earth's atmosphere.