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coral reef a structure that rises up from the bottom of the sea and is made up of the hard skeletons of tiny sea animals called corals. Coral reefs are found in warm, shallow sea waters around the world. The largest system of coral reefs is found in the Coral Sea off the northeastern coast of Australia.
Coral Sea a part of the southern Pacific Ocean located off the northwestern coast of Australia. The Coral Sea is the location of the largest collection of coral reefs in the world.
lagoon a shallow body of salt water by the sea. A lagoon is separated from the sea by sandbars, coral reefs, or islands. [1/2 definitions]
sponge a tiny sea animal that has a body with many holes. Thousands of kinds of sponges live in the ocean. Most kinds of sponges live in groups or colonies on coral reefs, rocks, shells, or other objects. [1/5 definitions]