A color sketch showing a side-cut view of volcano plane. Starting from the bottom, the lower level is convergent plate boundary covered by a layer of magma. Over the layer of magma is the lithosphere. There are vents vertical vents running through the three lower layers; these vents are called hot spots. Each hot spot creates a volcano. The sketch shows several types of volcanoes, stratovolcano, shield volcano and cinder cone volcano. The sketch also shows the oceanic spreading ridge and continental rim zone, both of these structures move, contributing to the formation of volcanos.
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