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Explosions may or may not represent a chemical change. A stick of TNT going off is a chemical explosion. A compressed gas cylinder with a failing weld that blows up while being filled is a mechanical explosion.

In the case of a volcano, the cause of the explosion is mechanical. We take a page from physics to answer this question. It is a buildup of pressure caused by heating of the magma (which may include gases and water) that causes the violent release of energy that we observe.

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