What is a coral reef?

What is a coral reef?

The coral reef is made by coral polyps, which are small anemone-like creatures with soft bodies. Each polyp builds a protective skeleton round its body form calcium carbonate (limestone). As it grows, it develops a filament from which another polyp sprouts. This also builds a protective skeleton around itself. In due course, the reef grows upwards and outwards, the outer layer consisting of living coral growing on the skeletons of dead coral inside. Coral reefs are found in warm clear, tropical waters.

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