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Secchi depth

the depth at which a Secchi disk is no longer visible from the surface of ocean water. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Secchi depth
A measure of the clarity of water, especially seawater. Secchi depth is measured using a circular plate, known as a Secchi disk, which is lowered into the water until it is no longer visible. High Secchi depths indicate clear water; whereas low Secchi depths indicate cloudy or turbid water. See also Secchi disk.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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