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continental shelf

a submerged shelf of land that begins at a continental shoreline, slopes downward gradually at an angle of about 0.1° for a variable distance, and ends at the top of a much steeper downward slope () at an angle of about 3° to 6° until it reaches the ocean floor: at the outer edge of the shelf the depth of the ocean is usually between about 90 m (300 ft) and 180 m (600 ft)

See continental shelf in American Heritage Dictionary 4

noun
A submerged border of a continent that slopes gradually and extends to a point of steeper descent to the ocean bottom.

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continental shelf

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