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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 eruptions are responsible for releasing molten rock, or lava, from deep within the Earth, forming new rock on the Earthâs surface. But eruptions also impact the atmosphere. The gases and dust particles thrown into the atmosphere during volcanic eruptions have influences on climate.Most of the particles spewed from volcanoes cool the planet by shading incoming solar radiation.ut eruptions also impact the atmosphere. The gases and dust particles thrown into the atmosphere during volcanic eruptions have influences on climate. Most of the particles spewed from volcanoes cool the planet by shading incoming solar radiation.