pyroclastic

• The photo also shows a ground-hugging plume of light gray ash, probably a mix of hot gas and ash in what volcanologists call a pyroclastic flow, descending from the volcano summit. —  Mr. Barlow's Blog
• Also visible, far below on the hillside, is the thunderous pyroclastic flow of super-heated rock as it cascades down the mountainside. —  Home | Mail Online
• Llaima, which lies in Chile's picturesque lake region about 435 miles (700 km) south of the capital Santiago, erupted on Jan. 1, 2008 and has spewed pyroclastic rock and ash sporadically since.
• The Chaiten volcano rumbled back into activity in February, threatening to devastate the area with new pyroclastic flows. —  Raw Story
• With all this talk of the physics of the twin tower and Bldg7 "collapses", I wonder if anyone else has noticed that both tower "collapses" featured a rising pyroclastic column of fine debris that was uncovered by the desceding debris 'halo'? —  Alex Jones' Prison Planet.com

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