Pompeii was destroyed because of the eruption of Mount Vesuvius on August 24, 79 CE. Just after midday on August 24, fragments of ash and other volcanic debris began pouring down on Pompeii, quickly covering the city to a depth of more than 9 feet (3 metres). Pyroclastic material—a fluidized mixture of hot rock fragments, hot gases, and entrapped air moving at high speed in thick dark clouds that hug the ground—reached the city on the morning of August 25 and soon asphyxiated those who had not already been killed. Additional pyroclastic flows and rains of ash followed, adding at least another 9 feet of debris.
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