define coral reef for class 4
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A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.
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Imagine putting on a snorkeling mask and flippers and swimming around in the warm water. Fish of many colors swim by you, and you see all different kinds of plants and tiny animals. You are exploring an underwater neighborhood that has been around for more than 200 million years, called a coral reef
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