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THE CORAL REEFSA living coral reef is an underwater ridge or mound built of fragments of coral sands and limestone.
The Great Barrier-Australia
This is the largest coral reef.
It it is visible from the space.
.
• Corals grow in clean water with temperatures between 20 and 30 Cº.
• They also need light.
• A special type of algae live in association with corals: the zooxanthellae, which produce the different colours.
RICH UNDERWATER LIFEA lot of species living in the coral reefs; 400 species of corals,1800 different species of fish,125 of sharks and 5000 of molluscs.