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The Great Barrier Reef is actually a series of smaller reefs. Reefs form under water and can be made of coral, sand, or rock. The top of the reef sits about two to three feet below sea level. Coral reefs are found in warm, shallow, clean water.
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The Great Barrier Reef is the largest reef of all, stretching an amazing 1,250 miles, or 2,000 kilometers, across the blue of the ocean. It forms a natural break water between the strong waves of the Pacific and the coast of Australia. It's location is in the Coral Sea, the area of the Pacific close to Australia's northeastern coast. The waters around it cover roughly 80,000 square miles, or 208,000 kilometers, an area slightly smaller than the state of Minnesota.
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A lagoon separates the barrier reef from the shore. An Atoll reef is a circular reef, usually with a lagoon in the center. The waves of the lagoon cover a submerged island. The reef grows in layers over the island.
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About three hundred fifty types of coral live and grow on the Great Barrier Reef. All have different skeleton shapes. One kind of coral looks like deer antlers! It is called staghorn coral, and is one of the more common corals on the reef. It is also one of the fastest growers. It can grow up to 4 inches, or 10 centimeters, a year.
