Coral reefs are underwater structures made from calcium carbonate secreted by corals. Coral reefs are colonies of tiny animals found in marine waters that ...

Coral reefs are the most diverse and beautiful of all marine habitats. Large wave resistant structures have accumulated from the slow growth of corals.

May 14, 2012 ... Information on coral reefs. Find out what the EPA does to protect them; includes participation on the Coral Reef Task Force and the ...

Non-profit organization working to keep coral reefs alive.

NOAA National Ocean Service Education: Corals: Importance of Coral Reefs.

The largest living structure, the Great Barrier Reef spans more than 1,200 miles (2,000 km) of islands and submerged reefs.