fringing reefs, barrier reefs, and atolls
Great barrier reefs are actually on top of the dead and old reefs and sea anemones. So the non living reefs are the foundations and support for the living reefs.
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coral reefs barrier reefs fringing reedfs atolls
Coral reefs can take four forms; fringing reef, platform reefs, barrier reefs and atolls. Fringing reefs are narrow and shallow, and generally occur near the shore, they literally are a thin 'fringe' along the coast. Platform reefs are reef outcroppings far from shore that occur in calm water. They often have a shallow lagoon, and are flat on top. Barrier reefs are reefs growing along a coastline that are separated from the coastline by a lagoon. Barrier reefs are very similar to fringings except that they are much larger. Atolls are ring reefs that usually form at the base of a volcano. Over time the volcano dissapears, leaving a rin of reef surrounded by deep ocean.
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the Great Barrier Reef off the coast of Austrailia.
Great Barrier Reef
there are the fringe,atoll and barrier
the great barrier reef
it is a stream 1cm deep
over 2,900 individual reefs and 900 islands