- Stock Photography: CORAL PIECES FROM NORTH EASTERN AUSTRALIA by Chriskiely
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- Photo title: Coral Pieces from North Eastern Australia
- Author: Chriskiely
- Cover photo description:
- It takes a long time to grow a big coral colony or a coral reef, because each coral grows slowly. The fastest corals expand at more than 6 inches 15 cm per year, but most grow less than an inch per year. Reefs themselves grow even more slowly because after the corals die, they break into smaller pieces and become compacted. Individual colonies can often live decades to centuries, and some deep-sea colonies have lived more than 4000 years. One way we know this is because corals lay down annual rings, just as trees do. These skeletons can tell us about what conditions were like hundreds or thousands of years ago. The Great Barrier Reef as it exists today began growing about 20,000 years ago.
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