   Reef
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Sigma KEE - Reef
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Reef
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A Reef is a ridge of rock, coral, or sand at or near the surface of a WaterArea.
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LandForm |
A LandForm is the class of geographically and/or geologically distinct areas that occur on Earth's surface, including mountains, hills, plains, valleys, deltas, and features of submerged land areas such as the ocean floor.
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CoralReef | CoralReef is the subclass of Reefs that are formed from living organisms that produce the limestone formations of the reef. Coral reefs include fringing reefs, barrier reefs, and Atolls. |
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