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TeachMeFinance.com - explain Tuff Tuff The term 'Tuff' as it applies to the area of volcanos can be defined as '　　 Volcanic rock made up of rock and mineral fragments in a volcanic ash matrix. Tuffs commonly are composed of much shattered volcanic rock glass--chilled magma blown into the air and then deposited. If volcanic particles fall to the ground at a very high temperature, they may fuse together, forming a welded tuff'. The term 'Tuff' as it applies to the area of reclamation can be defined as ' Igneous rock formed from hardened volcanic ash'. Previous 5 Terms: Tube valve tuberiferous tuberiform tubiform tucutucu Next 5 Terms: Tule Fog Tumor tumorigenic tun tundra 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.