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Coral can be divided into shallow water coral reef and deep-sea corals.
Shallow water coral reef has a wide distribution。There has more isle form of coral reef in the area of shallow water of Pacific Ocean,Indian Ocean and Atlantic. The density of shallow water coral less than 2 ,and the rigidity of it less than 2 too.It can not be used to as the raw materials of the carving art, for viewing only as a Kistler.

Shallow water coral