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…

Deadly beauty, 6/17/1991, Mount Pinutabo in the Philippines, erupted releasing massive quantities of pyroclastic flow, which is seen behind the truck in this image. Pyroclastic flow can move at speeds exceeding 600 mph.

Deadly beauty, 6/17/1991, Mount Pinutabo in the Philippines, erupted releasing massive quantities of pyroclastic flow, which is seen behind the truck in this image. Pyroclastic flow can move at speeds exceeding 600 mph.

▶ Extreme Pyroclastic Flows At Sinabung Volcano, Indonesia 21st Jan 2014 - Mount Sinabung is a Pleistocene-to-Holocene stratovolcano of andesite and dacite in the Karo plateau of Karo Regency, North Sumatra, Indonesia, 25 miles from Lake Toba supervolcano.

▶ Extreme Pyroclastic Flows At Sinabung Volcano, Indonesia 21st Jan 2014 - Mount Sinabung is a Pleistocene-to-Holocene stratovolcano of andesite and dacite in the Karo plateau of Karo Regency, North Sumatra, Indonesia, 25 miles from Lake Toba supervolcano.

Watch pyroclastic flow surge down the hillside during Sinabung volcano eruption

Watch pyroclastic flow surge down the hillside during Sinabung volcano eruption

Ain't nature grand? This Volcano's Pyroclastic Flow Was So Hot It Created Tornadoes (VIDEO)

WATCH: This Volcano's Eruption Created Tornadoes

Ain't nature grand? This Volcano's Pyroclastic Flow Was So Hot It Created Tornadoes (VIDEO)

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