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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.
A volcano is a hollow vent in the Earth's surface, through which hot, molten rock, called magma, along with some gases and hot ash, oozes out from the Earth's interior. Magma erupting from a volcano is called lava.This magma is stored in the interior of the Earth in a sort of a large reservoir known as magma chamber.It is in this chamber that the formation of magma takes place by continuous melting of solid rock.Owing to this, the temperature of the magma chamber is immensely high.agma erupting from a volcano is called lava. This magma is stored in the interior of the Earth in a sort of a large reservoir known as magma chamber. It is in this chamber that the formation of magma takes place by continuous melting of solid rock. Owing to this, the temperature of the magma chamber is immensely high.