Coral+Reefs



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**__What Are Coral Reefs__**
Coral reefs are made up of corals and the animals around them. Corals started appearing in the last 400 million years, and most modern reefs have been forming for the last 25 million years. Corals are anthozoans, there are 6000 known species in this class including corals, sea fans, and anemones. The reefs are made out of coral which is formed by thousands of polyps coming and making a colony.

Polyps
Coral Reefs are made up of polyps, when polyps die new one grow on top and over millions of years giant coral structures grow making the reefs.



Different types of Reefs
Fringing Reef Barrier Reef Patch Reef Apron Reef Bank Reef Ribbon Reef Atoll Reef Table Reef

Here is a great site to find what lives in a Coral Reef [|List of fish]