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| lagoon shallow body of water, especially one separated from a sea by sandbars or coral reefs |
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tidal flats nearly flat coastal area, alternately covered and exposed by the tides, and consisting of unconsolidated sediments |
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continental shelf submerged border of a continent that slopes gradually and extends to a point of steeper descent to the ocean bottom. |
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reef An erosion-resistant marine ridge or mound consisting chiefly of compacted coral together with algal material and biochemically deposited magnesium and calcium carbonates. |
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The gently sloping submarine fringe of a continent. This is ended by a steep continental slope which occurs at around 150 m below sea level. The UN Convention on the Continental |
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abyssal plain
Flat seafloor area at a depth of 10,000 – 20,000 ft (3,000 – 6,000 m), generally adjacent to a continent. The larger plains are hundreds of miles wide and thousands of miles long |
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