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How Do Volcanoes Form?

The Earth’s Layers and Volcanic Activity The Earth is composed of several layers, including the inner core, outer core, mantle, and crust. The mantle is the thickest layer, and it is where most of the Earth’s volcanic activity occurs. Volcanoes form when magma, which is molten rock beneath the Earth’s surface, rises up and erupts onto the surface. Magma is…