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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.
52. An energy source called geothermal energy is provided by water heated by magma. 53. A string of islands known as island arc can form from the collision of two oceanic plates. 54. The resistance of a liquid to flow is called viscosity. 55. Molten materials that leaves a volcanoes vent is known as lava.