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TeachMeFinance.com - explain Blocks Blocks The term 'Blocks' as it applies to the area of volcanos can be defined as '　　 Tephra is the general term now used by volcanologists for airborne volcanic ejecta of any size. Historically, however, various terms have been used to describe ejecta of different sizes. ... Fragments larger than about 2.5 inches are called blocks if they were ejected in a solid state and volcanic bombs if ejected in semi-solid, or plastic, condition. 　　 Fragments of lava or rock larger than 64 millimeters in size that are blasted into the air by volcanic explosions'. Previous 5 Terms: BLO Blocked Flow Blocking Diode Blockloading Block-rate structure Next 5 Terms: Blood Culture Blood Urea Nitrogen Blowdown Blowing Blowing Dust or Sand 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.