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Coral Reefs - National Geographic Society
https://www.nationalgeographic.org/article/coral-reefs/
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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Coral reef - Wikipedia
https://en.wikipedia.org/wiki/Coral_reef
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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Coral reef | Description, Geochemistry, Origins, & Threats
https://www.britannica.com/science/coral-reef
Web2 days ago · coral reef, ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons of certain coelenterates, of which coral polyps are the most important. A coral reef may grow into a permanent coral island. Often called the “rainforests of the sea,” coral reefs are home to a spectacular variety of organisms. Structure
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Coral - National Geographic Society
https://www.nationalgeographic.org/encyclopedia/coral/
WebOct 19, 2023 · Coral reefs are among the most complex and fascinating marine ecosystems in the sea, and they include a wide range of symbiotic relationships. Coral reefs are sometimes known as the “rainforests of the sea.” Nearly a quarter of all the fish in the sea rely on healthy coral reefs. Corals provide habitats for fish and other organisms in the ...
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Coral reef ecosystems - National Oceanic and Atmospheric Administration
https://www.noaa.gov/education/resource-collections/marine-life/coral-reef-ecosystems
WebFeb 1, 2019 · 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.
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Coral Reefs and Corals | Smithsonian Ocean
https://ocean.si.edu/ocean-life/invertebrates/corals-and-coral-reefs
WebCoral reefs are the most diverse of all marine ecosystems. They teem with life, with perhaps one-quarter of all ocean species depending on reefs for food and shelter. This is a remarkable statistic when you consider that reefs cover just a tiny fraction (less than one percent) of the earth’s surface and less than two percent of the ocean bottom.
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Reef - National Geographic Society
https://www.nationalgeographic.org/encyclopedia/reef/
WebOct 19, 2023 · Coral Reef. Ecosystems are sometimes classified into terrestrial, or land-based, and aquatic. This aquatic ecosystem is a coral reef off the shores of Papua New Guinea in the Pacific Ocean. Coral reefs are one of the most diverse and delicate ecosystems on the planet. Photograph by Karen Schofield, MyShot. Powered by. Article. …
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What Are Coral Reefs? | Live Science
https://www.livescience.com/40276-coral-reefs.html
WebSep 24, 2018 · Coral reefs are large underwater structures composed of the skeletons of colonial marine invertebrates called coral. The coral species that build reefs are known as hermatypic, or "hard,"...
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Coral Reefs 101 | National Geographic - YouTube
https://www.youtube.com/watch?v=ZiULxLLP32s
WebNov 7, 2017 · National Geographic. 22.9M subscribers. Subscribed. 17K. 1.8M views 6 years ago. What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know...
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Coral Reefs Ecology & Biodiversity - Coral Reef Alliance
https://coral.org/en/coral-reefs-101/
Web840 species of corals. Over 1 million species of other animals. Why are coral reefs so important? 275 million people live within 19 miles (30km) of coral reefs. Over 100 countries benefit from the recreational value of coral reefs. …
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