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TeachMeFinance.com - explain Ash (volcanic) Ash (volcanic) The term 'Ash (volcanic)' as it applies to the area of volcanos can be defined as 'Fragments less than 2 millimeters (about 1/8 inch) in diameter of lava or rock blasted into the air by volcanic explosions. Fragments of lava or rock smaller than 2 millimeters in size that are blasted into the air by volcanic explosions. Fine pyroclastic material in fragments less than 4.0 millimeters in diameter. 'Ash' in this sense is quite distinct from the ash produced by common combustion because the rocks do not catch fire and burn during a volcanic event'. Previous 5 Terms: ASCS ASEAN aseismic ridge ASFSA Ash Next 5 Terms: Ash cloud Ash flow Ashfall Advisory ASIA Asian long-horned beetle 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.