Continental-shelf meaning

(nautical) The area of sea around a land mass where the depth gradually increases before it plunges into the ocean deeps.
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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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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 (continental 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)
noun
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The part of the edge of a continent between the shoreline and the continental slope. It is covered by shallow ocean waters and has a very gentle slope.
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