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Watch Bill Nye The Science Guy online: Episode 14 Volcanoes

Volcanoes are mountains made from molten rock. The Earth�s crust is divided into big slabs, called plates, which are slowly moving all the time. The plates are floating on the Earth�s mantle, a layer of gooey hot rock that flows like maple syrup. Some places in the mantle, the rock gets very hot and nearly liquid. It�s called magma. Sometimes the magma reaches the Earth�s surface and forms a volcano.

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