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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
Key facts. 1  A volcano is formed by eruptions of lava and ash. 2  Volcanoes are usually cone shaped mountains or hills. 3  When magma [magma: Magma is molten rock. ] 4  reaches the Earth's surface it is called lava.5  When the lava cools, it forms rock. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption. 2  The lava from the eruption cools to form new crust. 3  Over time, after several eruptions, the rock builds up and a volcano forms.