What is a pyroclastic flow?

Answer

This is the big cloud of ash you see shortly after the volcano erupts. It's a giant cloud of ash, hot rocks, and other debris from the volcano. It's not rare to see lightning in one of these flow clouds. These pryroclastic flows are highly dangerous and will kill a person within seconds. It will destroy everything in it's path. It's very fast moving.
Q&A Related to "What is a pyroclastic flow?"
a pyroclastic flow is a cloud of volcanic bombs, volcanic blocks, volcanic ash, and lapilli. these flows can achieve speeds at over 125 miles per hour and can be more than 750 degrees
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( ¦pī·rə¦klas·tik ′flō ) (geology) Ash flow not involving high-temperature conditions.
http://www.answers.com/topic/pyroclastic
Pyroclastic flow: A hot, dry, fast-moving, and high-density mixture of
http://www.chacha.com/question/what-is-the-definit...
Pyroclastic cloud is airborne mater where as a flow would be like an avalanche or mud flow coming down the side if the volcano.
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