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Volcano volcano is a vent created by earths crust. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.

A volcano is a mountain that has, or had, lava (hot, liquid rock) come from a magma chamber under the ground. Volcanoes are formed by the movement of tectonic plates. ... the materials include lava, steam, gaseous sulfur compounds, ash and broken rock pieces. When there is enough pressure, the volcano erupts.

A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur. Gases and rock shoot up through the opening and spill over or fill the air with lava fragments.

Volcanoes happen when magma rises to the surface of the earth, which causes bubbles of gas to appear in it. This gas can cause pressure to build up in the mountain, and it eventually explodes. When the magma bursts out of the earth, it is called lava.

Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the solved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.

5 interesting facts about volcanoes. A volcano is a mountain that opens downward to a pool of molten rock below the surface of the Earth. When pressure builds up, eruptions occur. In an eruption, gases and rock shoot up through the opening and spill over or fill the air with lava fragments.