• 1. Reef - Wikipedia

  wikipedia.org

  Link: https://en.wikipedia.org/wiki/Reef

  Description: WEBA reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic (non-living) processes such as deposition of sand [ citation needed ] …

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• 2. Reef - National Geographic Society

  nationalgeographic.org

  Link: https://www.nationalgeographic.org/encyclopedia/reef/

  Description: WEBOct 19, 2023 · A reef is a ridge of material at or near the surface of the ocean.Reefs can occur naturally. Natural reefs are made of rocks or the skeletons of small animals called corals.Reefs can also be artificial—created by human beings. Artificial Reefs People create reefs for three chief reasons. The first is to protect the coastline.Reefs act as barriers …

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• 3. Coral Reefs - National Geographic Society

  nationalgeographic.org

  Link: https://www.nationalgeographic.org/article/coral-reefs/

  Description: WEBOct 19, 2023 · Coral reefs are important ocean habitats and offer a compelling case of the risks of climate change. Reefs provide a large fraction of Earth’s biodiversity —they have been called “the rain forests of the seas.”. Scientists estimate that 25 percent of all marine species live in and around coral reefs, making them one of the most diverse ...

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• 4. Coral reef | Description, Geochemistry, Origins, & Threats

  britannica.com

  Link: https://www.britannica.com/science/coral-reef

  Description: WEB4 days ago · 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.

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• 5. Coral reef - Wikipedia

  wikipedia.org

  Link: https://en.wikipedia.org/wiki/Coral_reef

  Description: WEBA coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. 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 jellyfish.

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• 6. Coral - National Geographic Society

  nationalgeographic.org

  Link: https://www.nationalgeographic.org/encyclopedia/coral/

  Description: WEBOct 19, 2023 · Colorful Coral Reef. Though coral reefs are called such because of their sprawling colonies of coral, the shelter created by these coral colonies make reefs a virbant biodiveristy hotspot where coral, fish, algae, and hundreds of other species live together in a bustling ecos. Photograph by Christ Newbert / Minden Pictures

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• 7. Coral reef ecosystems - National Oceanic and Atmospheric …

  noaa.gov

  Link: https://www.noaa.gov/education/resource-collections/marine-life/coral-reef-ecosystems

  Description: WEBFeb 1, 2019 · Topics: 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. Thousands of species of corals have been discovered; some live in warm, shallow, …

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• 8. Coral reef - Marine Ecosystem, Formation, Diversity | Britannica

  britannica.com

  Link: https://www.britannica.com/science/coral-reef/Origin-and-development-of-reefs

  Description: WEBCoral reefs are best developed where the mean annual surface water temperatures are approximately 23–25 °C (73–77 °F). No significant reefs occur where such temperatures fall below about 18 °C (about 64 °F), although a few reef coral species can exist in temperatures considerably below this.

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• 9. Coral Reefs | UNEP - UN Environment Programme

  unep.org

  Link: https://www.unep.org/topics/ocean-seas-and-coasts/blue-ecosystems/coral-reefs

  Description: WEBCoral Reefs. About. Coral reefs are the most biodiverse ecosystem in our ocean. They occur in more than 100 countries and territories, and whilst they cover less than 1 per cent of the seafloor, they support at least 25 per cent of marine species – harbouring the highest biodiversity of any ecosystem globally and making them one of the most ...

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• 10. Coral reefs: Essential and threatened | National Oceanic and

  noaa.gov

  Link: https://www.noaa.gov/explainers/coral-reefs-essential-and-threatened

  Description: WEBMany of the world’s reefs have already been destroyed or severely damaged by an increasing array of threats, including pollution, unsustainable fishing practices, and global climate change. As a result, 22 species of coral are now listed as …

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