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TeachMeFinance.com - explain photic zone photic zone The term 'photic zone' as it applies to the area of coastlines can be defined as ' the zone extending downward from the ocean surface within which the light is sufficient to sustain photosynthesis. the depth of this layer varies with water clarity, time of year and cloud cover, but is about 100 m in the open ocean. it may be considered the depth to which all light is filtered out except for about one percent and may be calculated as about two and one-half times the depth of a secchi disk reading'. Previous 5 Terms: phonology phonometer phonophobia phorometer Phosphorus Next 5 Terms: photobiology photochemical smog photochemistry photodissociation photoelectric 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.