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TeachMeFinance.com - explain Exosphere Exosphere The term 'Exosphere' as it applies to the area of Earth observation can be defined as ' The uppermost layer of the atmosphere, its lower boundary is estimated at 500 km to 1000 km above the Earth's surface. It is only from the exosphere that atmospheric gases can, to any appreciable extent, escape into outer space'. The term 'Exosphere' as it applies to the area of the weather can be defined as ' The upper most layer of the earth's atmosphere; the only layer where atmospheric gases can escape into outer space'. Previous 5 Terms: exobiology exogenous Exogenous DNA Exon Exonuclease Next 5 Terms: Exotic species Exotic species expanded access Expanded Food and Nutrition Education Program (EFNEP) expanded notation 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.