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Pyroclastic flow will destroy nearly everything in its path. With rock fragments ranging in size from ash to boulders traveling across the ground at speeds greater than 80 km per hour, pyroclastic flows knock down, shatter, bury or carry away nearly all objects and structures in their way. The extreme temperatures of rocks and gas inside pyroclastic flows, between 200°C and 700°C, can cause combustible material to burn, especially petroleum products, wood, vegetation, and houses. -- Samuel…

Pyroclastic flow will destroy nearly everything in its path. With rock fragments ranging in size from ash to boulders traveling across the ground at speeds greater than 80 km per hour, pyroclastic flows knock down, shatter, bury or carry away nearly all objects and structures in their way. The extreme temperatures of rocks and gas inside pyroclastic flows, between 200°C and 700°C, can cause combustible material to burn, especially petroleum products, wood, vegetation, and houses. -- Samuel…

Small pyroclastic flow from Unzen. http://volcano.oregonstate.edu/book/export/html/367

Small pyroclastic flow from Unzen. http://volcano.oregonstate.edu/book/export/html/367

Pyroclastic flow sweeps down the side of Mayon Volcano, Philippines, during an explosive eruption on 15 September 1984. Note the ground-hugging cloud of ash (lower left) that is billowing from the pyroclastic flow and the eruption column rising from the top of the volcano.  Credit: Photograph by C. Newhall on 15 September 1984.

Pyroclastic flow sweeps down the side of Mayon Volcano, Philippines, during an explosive eruption on 15 September 1984. Note the ground-hugging cloud of ash (lower left) that is billowing from the pyroclastic flow and the eruption column rising from the top of the volcano. Credit: Photograph by C. Newhall on 15 September 1984.

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

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

Santiaguito volcano (Guatemala): partial dome collapse generates strong explosion and pyroclastic flows. August 2013

Santiaguito volcano (Guatemala): partial dome collapse generates strong explosion and pyroclastic flows. August 2013

Watch pyroclastic flow surge down the hillside during Sinabung volcano eruption

Watch pyroclastic flow surge down the hillside during Sinabung volcano eruption