A volcano is an opening in the earth's surface, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involves the pushing out of rock which usually forms mountains.
The heat at the earth's core or center causes bubbles of carbon dioxide in magma to get bigger and expand. This expanding gas pushes magma into the vent of a volcano and up to the surface of the Earth. When a volcano erupts or overflows from the top of the vent hot lava flows over its sides. Gas and ashes sometimes accompany the flow of lava.
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