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When a volcano erupts violently it expels large amounts of ash, gas, and pumice. Some of this material will race down the sides of the volcano as hot avalanche-like masses called pyroclastic flows. Pyroclastic flows are the most dangerous product of volcanic eruptions; they are unsurvivably hot and carry enough force to level concrete buildings. If ash mixes with a large amount of water it can form deadly mudflows called lahars that can bury entire towns.

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