abyssal plain

Main Entry:  abyssal plain
Part of Speech:  n
Definition:  a large area of extremely flat or gently sloping ocean floor just offshore from a continent, at depths of 13,000-20,000 feet
Example:  The abyssal plains begin where the continental margins end. Several species of worms, shrimp, brittle stars, sea cucumbers, and fish live in abyssal plains.
Usage:  geography
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