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the two tectonic plates move toward each other. This tectonic action is called a convergent plate boundary. The heavier plate slides under the lighter plate causing the magma or heated rock to move upward. That magma finds a crevice in the earth's crust and a volcano is formed. In this case Mt. Vesuvius which destroyed Pompeii, Herculaneum, and Stabia in AD 79.

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14y ago

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