They are built from colonial polyps from the phylum Cnidaria which secrete an exoskeleton of calcium carbonate.The reefs are formed in tropical marine areas (30 degrees north and south of the equator) and between the tropics. Coral polyps, the animals primarily responsible for building reefs, can take many forms: large reef building colonies, graceful flowing fans, and even small, solitary organisms.Thousands of species of corals have been discovered; some live in warm, shallow, tropical seas and others in the cold, dark depths of the ocean. In 2005, the U.S. lost half of its coral reefs in the Caribbean in one year due to a massive bleaching event. It has a simple, tubelike body with tentacles at one end. Coral reef definition: A coral reef is a long narrow mass of coral and other substances, the top of which is... | Meaning, pronunciation, translations and examples Define reef. Learn more. If you have any other question or need extra help, please feel free to contact us or use the search box/calendar for any clue. Often called ‘rainforests of the sea,’ coral reefs are home to a spectacular variety of organisms. On this page you will find the solution to Coral reef crossword clue crossword clue. A coral reef is a ridge or a mound of limestone whose upper surface is near the surface of the sea. A strip or ridge of rocks, sand, or coral that rises to or near the surface of a body of water. Coral Reef Formation A coral is known as a polyp. In most healthy reefs, stony corals are predominant. Coral reefs are some of the most diverse ecosystems in the world. Most hard corals reproduce by budding, a process of forming small buds that develop into new polyps. reef synonyms, reef pronunciation, reef translation, English dictionary definition of reef. This clue was last seen on October 28 2020 on New York Times’s Crossword. Coral reefs cover less than 1 percent of the ocean floor — all the reefs combined would equal an area of about 110,000 square miles (285,000 square km), only about the … ‘The protected coral reef is close enough to shore to explore in safety with a snorkel.’ ‘Coral reefs are among the world's most productive ecosystems.’ ‘Surely, people would not knowingly live in ways that threaten polar bears or coral reefs.’ A coral reef is a large underwater structure made of dead and living corals (press to see more). Coral reefs are made up of calcium carbonate. human impact on coral reefs is significant, coral reefs are dying all around the world by mining, over fishing, blast fishing and the digging of canals and access into island and bays are threatened. n. 1. The warm waters centered around the northern Antilles near the Virgin Islands and Puerto Rico expanded southward. coral reef meaning: 1. an area of coral, the top of which can sometimes be seen just above the sea 2. an area of coral…. 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