Saturday, May 16, 2009

Coral reefs

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Teeming with the wildlife from shrimps to sharks, coral reefs are some of the most beautiful underwater structures. A coral reef takes thousands of years to form, it is composed of the living and dead skeletons of colonies of tiny animals called corals. Corals have flourished and built reefs in shallow, tropical seas for more than 440 million years. Corals are related to sea anemones and jelly fish, and belong to the group of animals called coelenterates. Australia’s Great Barrier reef is 2000 km in length but is under threat from increased pollution. Pollution has spread its tentacles over coral reefs too. :-(



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