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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.
Volcanoes emit millions of tons of gas into the atmosphere every day, but which gases are being produced? A small volcano from New Zealand is active and scattering dust, smoke and vapour every day. A volcanologist is investigating which gases are produced by the volcano. He collects the samples by inserting a tube inside the volcano. He identifies the main gases produced as water vapour (80%) and carbon dioxide (15%). Sulphur and hydrogen chloride are also produced.