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Use the following words in a sentence to explain how volcanoes are formed.

convect, magma, mantle, core, tectonic plates.

User Barnack
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As the oceanic tectonic plate descends into the mantle some of it melts. This material convects into the mantle above the plate and causes the mantle to melt. This liquid rock, called magma, rises to the surface from the core because it is less dense then the surrounding rock. If the magma reaches the surface of the Earth, a volcano forms.
User BenoitVasseur
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