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pyroclastic flow

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pyroclastic flow [¦pī·rə¦klas·tik ′flō]
(geology)
Ash flow not involving high-temperature conditions.
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The MESSENGER scientists are also seeing features that seem to be volcanoes, and include smooth areas that could be the residues from pyroclastic flows - outbursts of hot rocks and gas.
1 billion year old crater on Mercury proof of recent volcanism by Asian News International
The Chaiten volcano rumbled back into activity in February, threatening to devastate the area with new pyroclastic flows.
Chile volcano spews lava, ash -- dozens evacuated by AFP / AFP Global Edition
Scientists at the Montserrat Volcano Observatory (MVO) said that a partial collapse of the dome sent pyroclastic flows down over Plymouth and into the sea, on the western side of the Soufriere Hills volcano, reports Caribbean Net News (July 28, 2008).
Partial dome collapse by Wagenheim, Kal / Caribbean Update
 
 
 
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