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TeachMeFinance.com - explain pyroclastic flow pyroclastic flow The term 'pyroclastic flow' as it applies to the area of volcanos can be defined as '　　 A hot, fast-moving and high-density mixture of fine and coarse particles and gas formed during explosive eruptions or from the collapse of a lava dome. 　　 Lateral flowage of a turbulent mixture of hot gases and unsorted pyroclastic material (volcanic fragments, crystals, ash, pumice, and glass shards) that can move at speed (50 to 100 miles an hour). The term also can refer to the deposit so formed. 　　'. The term 'pyroclastic flow' as it applies to the area of Earth observation can be defined as ' a fast-moving, fluid-like cloud of hot ash, pumice, rock fragments, and gas that occurs during explosive volcanic eruptions or the collapse of a lava dome'. Previous 5 Terms: pyriform Pyrimidine pyritiferous pyroballogy Pyroclastic Next 5 Terms: Pyroclastic surge　 pyrogenic pyrogenous pyrography Pyrolysis About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.