What Is Coral Made of?

Answer

Coral reefs are made of thin layers of calcium carbonate, which are made by small carnivorous animals known as polyps. The texture and shape of the corals depends on their environment as, for instance, those that are smooth and rounded grow in areas of the sea or ocean that have strong waves.
2 Additional Answers
Coral is made up of paper-thin layers of calcium carbonate, also known as limestone. It is actually a shell created by an animal which is also called a coral.
Coral is made by millions of tiny animals called polyps. Polyps cannot leave their limestone homes, but they are animals - not plants. As they eat they build a case of limestone around them, sort of like a little house.
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Coral is an animal. Coral reefs are made of coral and their shells. The shells consist of limestone. Coral reefs are an important part of ocean life. They provide shelter and hiding
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Coral begins its journey as a biologically active, organic, calcium carbonate deposit derived from a marine creature-a coral polyp. Polyps grow in the tropical oceans, including those
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Coral reefs are made up of many things. The coral itself produces calcium carbonate which gives structure to the reef. However there is also an algae which produces limestone at the
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The external calcareous reef skeleton is made by large groups of invertebrate coral. The
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