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The roofs in Pompei collapsed under the weight of falling ash, only a few centimetres of ash fell on Herculaneum, causing little damage. Subsequently, there was a succession of six pyroclastic flows (a mixture of ash and gases) which then solidified. These gradually buried the city's buildings from the bottom up, causing relatively little damage. The good state of preservation of the site is due to its rapid filling by these flows, which prevented the buildings from collapsing.

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