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Tag Archives: At Subduction Boundaries

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How and Where Volcanoes Form

ScienceBy William Anderson (Schoolworkhelper Editorial Team)September 24, 2010Leave a comment

Volcanoes form where magma reaches Earth’s surface. Volcano:  the opening in Earth’s crust through which magma, gases, and ash erupt, and the landform that develops around this opening *A volcanic eruption occurs when magma rises to the surface. –How does this magma form? 3 ways: 1.  A decrease in pressure– lowers melting temperature and allows…

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