As the water rises into the mantle of the overriding plate , it lowers the melting temperature of the surrounding mantle , producing ``melts (magma . These melts rise to the surface and are the source of some of the most explosive volcanism on Earth because of their high volumes of extremely pressurized gases . Mount St . Helens was formed in this way . As these melts rise to the surface and cool , they form long chains of volcanoes inland from the continental shelf and...
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