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Reef - Wikipedia
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 deposition of sand or wave erosion planing down rock outcrops.
Coral reef | Description, Geochemistry, Origins, & Threats
2024年11月18日 · 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 permanent coral island. Often called ‘rainforests of the sea,’ coral reefs are home to a spectacular variety of organisms.
What is a Coral Reef? - NASA
2024年10月15日 · A coral reef is a term used to describe the collective structure of hard corals that help shape a coral reef ecosystem. “A coral reef is a reef whose main structure is made by living organisms, in this case corals,” said Torres-Pérez.
Coral reef - Wikipedia
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] Most coral reefs are built from stony corals, whose polyps cluster in groups. Coral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and ...
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Reef - National Geographic Society
2023年10月19日 · As it grows, a coral reef provides homes for a vast number of living creatures. Coral reefs are among the richest, most varied communities of life found anywhere in the ocean. Many reef creatures, including the coral polyps themselves, are nocturnal. They are …
Coral reef ecosystems - National Oceanic and Atmospheric …
2019年2月1日 · Coral reefs are some of the most diverse ecosystems in the world. 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.
Coral Reefs 101 | National Geographic - YouTube
What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know about reefs and the tiny animals—polyps—that bui...
What Are Coral Reefs? - Live Science
2018年9月24日 · The largest coral reef in the world, the Great Barrier Reef, is home to at least 400 individual species of coral and thousands of different species of fish, mollusks, sea snakes, sea turtles ...