continental slope

noun Physical Geography.
a steep slope separating a continental shelf and a deep ocean basin.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
continental slope  
The sloping region between a continental shelf and a continental rise. A continental slope is typically about 20 km (12.4 mi) wide, consists of muds and silts, and is often crosscut by submarine canyons.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The shelf ends at a break, where the increased steepness is defined as the
  continental slope.
These landslides either originate in submarine canyons or on the continental
From the break, the shelf descends toward the deep ocean floor in what is
  called the continental slope.
At the outer edge of the continental shelf, the land drops off sharply in what
  is called the continental slope.
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