Coral reefs.

WHAT IS CORAL? "Coral is a common name for members of a large class of marine invertebrates characterized by a protective calcium carbonate or horny skeleton." This is how the Microsoft Encarta Encyclopedia described coral. This calcium carbonate or horny skeleton is also called coral. Coral may look like an inanimate rock, but it is actually a living animal. Corals belong to a group of animals that include sea anemones and jellyfish. These animals have …

…on the sea bed of the continental shelf that is raised and close to the surface. Bibliography. All information was gathered from the internet and therefore books, authors and publication dates are not available. Also, the exact sites which the information was retrieved are not available. However the search engines that were used are: www.yahoo.com - Yahoo! www.msn.com - MSN www.ask.com - Ask Jeeves. www.google.com - Google.