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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.
The name volcano comes from Vulcan, the Roman god of fire! A volcano is formed when hot molten rock, ash and gases escape from an opening in the Earthâs surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape shown here. As a volcano erupts, it spills lava that flows downslope. volcano is formed when hot molten rock, ash and gases escape from an opening in the Earthâs surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape shown here.