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Off the coast of Chile two tectonic plates come together. The Nazca Plate, an oceanic plate, is slowly sliding into and under the South American Plate. As it sinks into the mantle this plate takes seawater and other volatiles with it. These substances seep into the mantle and lower the melting point of the rock. This forms molten magma that rises though the crust of the South American Plate to erupt from volcanoes.

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12y ago

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