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- 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
- Coral reef | Description, Geochemistry, Origins, Threats | Britannica
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
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 ecosystems - National Oceanic and Atmospheric Administration
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 Reef Alliance - Saving the World’s Coral Reefs
Millions of people and species of wildlife depend on coral reefs While climate change threatens their future, science shows that corals can adapt and survive if we keep them healthy
- Basic Information about Coral Reefs - US EPA
Coral reefs are among the most biologically diverse and valuable ecosystems on Earth This web site describes the importance of coral reefs, threats to them, and ongoing efforts to protect them
- Corals Tutorial: Why are coral reefs important?
This tutorial is an overview of the biology of and threats to coral reefs, as well as efforts being made to conserve and protect them It includes images, animations, and videos
- Coral reefs | UNEP - UN Environment Programme
Coral reefs underpin the safety, coastal protection, well-being, food security, and economic security of hundreds of millions of coastal people in least developed countries, economies in transition, and small island developing states around the world
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