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Related to echo sounding: Abyssal plain
echo sounding[′ek·ō ‚sau̇nd·iŋ]
Determination of the depth of water by measuring the time interval between emission of a sonic or ultrasonic signal and the return of its echo from the sea bottom.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.