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Why did Pompeii remain preserved for centuries after the eruption?

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Ruins of ancient Pompeii with stone columns and walls in the foreground, and Mount Vesuvius rising in the background under a partly cloudy sky. — Pompeii Mount Vesuvius rising up over the ruins of the ancient Roman city Pompeii.

Pompeii remained preserved for centuries because of its sudden and deep burial following the eruption of Mount Vesuvius in 79 CE.21

The city was covered by a layer of volcanic debris—including ash, pumice, and pyroclastic material—reaching a depth of 19 to 23 feet (6 to 7 meters). This rapid entombment effectively sealed the city, protecting it for approximately 17 centuries from the destructive effects of weather, climate, vandalism, and looting.21