DivergingThe mid-ocean ridge is a diverging plate boundary and is where many volcanoes settle on. All of these volcanoes are under water except for a few in Iceland and the Azores Islands.
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ConvergingMost volcanoes form on plate boundaries where crusts sinks back into the mantle, melts into magma, and makes its way back toward the surface. In islands volcanoes are common. Two oceanic plates hit and the plate with more density falls underneath the other and into the asthenosphere where it forms into magma. This magma will seep through gaps in the ocean floor making volcanoes.
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Hot SpotsA hot spot is a place where hot magma from the earth's interior rises through the mantle and crust to form a volcanic feature. Unlike most volcanoes, volcanoes on hot spots lie in the middle of tectonic plates. Volcanoes on a hot spot do not result from subduction. When there is pressure in the mantle, part of the mantle pushes upward creating a bump. This bump moves higher melting everything in its way. After the magma reaches the surface it cools down creating a volcano.
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