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Volcanoes usually occur at the boundaries of tectonic plates for example at subduction zones (for example the volcanoes that form along the western edge of the continental United States) or along spreading boundaries, such as those that occur on the ocean bed along the Mid-Ocean-Ridges, though some of the major volcanoes on earth (such as Hawaii and Yellowstone) are caused by "hot zones" where large quantities of Magma are unusually close to the surface.

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13y ago

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