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TeachMeFinance.com - explain tephra tephra The term 'tephra' as it applies to the area of volcanos can be defined as '　　 Solid material of all sizes explosively ejected from a volcano into the atmosphere. 　　 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. Fragmental volcanic products between 0.1 to about 2.5 inches in diameter are called lapilli; material finer than 0.1 inch is called ash. 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'. The term 'tephra' as it applies to the area of carbon dioxide can be defined as ' Any rock material produced by a volcano'. Previous 5 Terms: tenrec tensimeter Tensiometer tensiometer Tentative Approval Next 5 Terms: Teratogen Teratogen Teratogenic teratogenic teratology 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.