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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) processes such as …

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 …

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.

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 covers around …

Etymology Noun Middle English riff "reef of a sail"; of Norse origin Noun from Dutch rif "reef of rocks or sand"; of Scandinavian origin

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 habitat, …

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.

1 day ago · Learn how coral reefs drive daily changes in ocean microbes — a process that shapes how nutrients and energy move through reef ecosystems.

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