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Sigma KEE - Reef
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reef
A Reef is a ridge of rock, coral, or sand at or near the surface of a WaterArea.
Relationships      
Parents land form 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.
Children coral reefCoralReef 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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