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Volcanoes tend to form on the land above an area where one techtonic plate is subducted beneath another. The eastern edge of the Pacific plate is being subducted under the South American plate. The subducted plate melts under the extreme pressure and temperature. The molten rock then works its way up through stress fissures, caused by the two plates colliding, to form volcanoes in the area above the subduction zone. This is why there are volcanoes along the length of the Andes.

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16y ago

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