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TeachMeFinance.com - explain Aa Aa The term 'Aa' as it applies to the area of volcanos can be defined as 'Aa (pronounced 'ah-ah' - a Hawaiian term), is lava that has a rough, jagged, spiny, and generally clinkery surface. In thick aa flows, the rubbly surface of loose clinkers and blocks hides a massive, relatively dense interior'. Previous 5 Terms: A A AMS A and E (A-E) A Index A Tier Next 5 Terms: AAAS AAC AAEA AAFCO AAHU 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.