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Terrifying, yet still beautiful. (wouldn't want to be in the car or taking the picture!)

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Pahoehoe lava, Mt. Kilauea, Hawaii Volcanoes National Park, Hawaii. Kilauea is home to the Hawaiian volcano goddess Pele. by AdrianW

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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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Excavated Ruins Of Herculaneum -- Destroyed during the eruption of Mount Vesuvius on 24 August 79 CE.

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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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from National Geographic News

Our All-Time Favorite Volcano Pictures

Mount Pinatubo, Philippines erupts

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A pyroclastic flow (also known scientifically as a pyroclastic density current) is a fast-moving current of hot gas and rock (collectively known as tephra), which reaches speeds moving away from a volcano of up to 700 km/h (450 mph).

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February 8, 2014 - Terrifying Sinabung Volcano Eruption. Pyroclastic flow as well as a towering cloud of tephra and gases

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This area in New Mexico owes its remarkable geology to layers of volcanic rock and ash deposited by pyroclastic flow from a volcanic explosion. Over time weathering and erosion of these layers has created canyons and tent rocks. The tent rocks themselves are cones of soft pumice and tuff beneath harder caprocks, and vary in height from a few feet to 90 feet.

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