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A volcano's deadly pyroclastic flow - the same thing that buried Pompeii. You can't outrun it: it travels at 700 km/h (450 mph) and you can't weather it in anything but highly specialized shelters: it's over 1,000 °C (1,830 °F). Once you see that in your rear view mirror, you're either already out of reach or you're not.

~Volcanic Eruption ~ Mount Sinabung spews a column of hot gas and ash skyward, as seen from Tigapancur village in Karo district, on November 14, 2013 | Ulet Ifansasti/Getty Images~~

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Pompeii preserves evidence of daily life in a Roman city in 79 AD when Vesuvius erupted a pyroclastic flow that buried it approximately to rooftop level, relatively quickly and permanently. This model gives some sense of the scale of this site.

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Pileus cloud above the Sarychev volcano as it erupts, Kuril Islands, Russia. Pileus clouds, also called scarf or cap clouds, are small clouds that form on top of a bigger cloud. In this photo a pileus cloud (centre) has formed above a cloud of volcanic ash from the Sarychev volcano. A large plume of smoke, steam and ash is erupting from the volcano while pyroclastic flow of denser ash descends the volcano sides. The picture was taken by astronauts aboard the International Space Station…

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