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TeachMeFinance.com - explain D Region D Region The term 'D Region' as it applies to the area of the weather can be defined as ' In solar-terrestrial terms, a daytime layer of the earth's ionosphere approximately 50 to 90 km in altitude'. Previous 5 Terms: cytometer Cytoplasmic trait Cytosine (C) CZMA D Next 5 Terms: dabchick Dacite dacryolith Dacthal (DCPA) dactyliology 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.