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A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. [1] Many reefs result from natural, abiotic (non-living) …

Dec 26, 2025 · Coral reef, ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons of coral polyps and other coelenterates. A coral reef may grow into a …

But how much do you know about reefs and the tiny animals—polyps—that build them? Learn all about coral and why warming waters threaten the future of the reef ecosystem....more

Sep 25, 2025 · 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.

Jun 16, 2025 · A reef is a vibrant, complex, and biologically diverse underwater ecosystem built primarily by living organisms, most notably corals. These calcium carbonate structures provide …

4 days ago · reef (plural reefs) A chain or range of rocks, sand, or coral lying at or near the surface of the water. (Australia, South Africa) A large vein of auriferous quartz; hence, any …

Oct 15, 2024 · “A coral reef will always be a reef, but not all reefs are coral reefs.” The largest coral reef in the world is Australia’s Great Barrier Reef, which is over 1,000 miles long and …

Oct 19, 2023 · A reef is a ridge of material at or near the surface of the ocean. There are natural and artificial reefs.

Dec 21, 2025 · Researchers retrieved reef monitoring devices that had been placed in deep coral reefs in Guam. The devices were placed up to 330 feet below the surface.