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TeachMeFinance.com - explain Pyroclastic surge　 Pyroclastic surge　 The term 'Pyroclastic surge　' as it applies to the area of volcanos can be defined as 'Similar to a pyroclastic flow but of much lower density (higher gas to rock ratio). 　　 Turbulent, low-density cloud of hot rock debris and gases that moves over the ground surface at high speed. 　　'. Previous 5 Terms: Pyrimidine pyritiferous pyroballogy Pyroclastic pyroclastic flow Next 5 Terms: pyrogenic pyrogenous pyrography Pyrolysis pyrometer 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.