As a noun, it is a hard, rock-like material formed by tiny sea animals, often building colorful reefs. As an adjective, it describes a pinkish-orange color similar to some coral.
From Old French *corail*, from Latin *corallium*, from Greek *korallion*, referring to the marine organism and its hard skeleton. It has been valued for jewelry and decoration for thousands of years.
Coral reefs look like underwater plants or rocks, but they’re actually massive cities built by tiny animals. These 'rainforests of the sea' support huge amounts of ocean life. Their sensitivity to temperature makes them an early warning system for climate change.
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