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A coral reef is a colony of corals. A coral reef can be formed on rock rubble, but old established coral reefs are actually structured out of dead coral. This is one of the reasons it takes so long for a reef to form. Some corals may life for tens or even hundreds of years before they die and allow another coral to grow on top of their skeleton.

There are many types of coral reefs, but the real difference is that coral is what makes up a coral reef.

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13y ago

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