Coral Reefs

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Corals are marine organisms that slowly deposit and grow upon the residues of their calcareous remains. These corals and residues gradually become structures known as coral reefs. This process of growth and deposition is extremely slow, and some of the larger reefs have been "growing" for hundreds of thousands of years.

The Great Barrier Reef Marine Park Authority estimates that corals have been growing on the Great Barrier Reef for 25 million years, and that coral reef structures have existed on the Great Barrier Reef for at least 600,000 years1.(2)

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