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Volcanic eruptions are caused when magma from the magma chamber of the Earth rises up the pipe and out of the vent.Magma is continuously supplied from the mantle of the Earth. Shield volcanoes usually have a gentle eruption, as it contains basic lava.nother type of eruption in what is known as a boiler volcano results from water that gets trapped inside porous rock, and is then heated by the mantle, until is turns into steam and the steam pressure causes the volcano to explode. These explosions can be extremely large.
A volcanic eruption occurs when molten rock, ash and steam pour through a vent in the earth's crust. Volcanoes are described as active (in eruption), dormant (not erupting at the present time), or extinct (having ceased eruption; no longer active).Some volcanoes explode.Others are slow-flowing fountains of lava, which is hot fluid rock. The following are examples of famous volcanic eruptions.olcanoes are described as active (in eruption), dormant (not erupting at the present time), or extinct (having ceased eruption; no longer active). Some volcanoes explode. Others are slow-flowing fountains of lava, which is hot fluid rock.