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Coral reef

en.wikipedia.org/wiki/Coral_reef

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals ...

Coral Reef | Basic Facts About Coral Reefs | Defenders of Wildlife

www.defenders.org/coral-reef/basic-facts

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. About one-third of all marine fish species live ...

Corals and Coral Reefs | Smithsonian Ocean Portal

ocean.si.edu/corals-and-coral-reefs

Coral 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 ...

Coral Reefs

life.bio.sunysb.edu/marinebio/coralreef.html

Coral reefs are the most diverse and beautiful of all marine habitats. Large wave resistant structures have accumulated from the slow growth of corals.

Coral Reefs - National Geographic

video.nationalgeographic.com/video/coral-reefs

Coral reefs are the foundation of many marine ecosystems—and they are in danger.

Corals, Coral Pictures, Coral Facts - National Geographic

animals.nationalgeographic.com/animals/invertebrates/coral/

Coral organisms, called polyps, can live on their own, but are primarily associated with the spectacularly diverse limestone communities, or reefs, they construct.

Coral reefs | WWF

wwf.panda.org/what_we_do/endangered_species/coral/

Conservation of ocean environments, seas, coasts, the coral reefs and their magnicient diversity of marine animals and plants.

How Reefs Are Made | Coral Reef Alliance

coral.org/coral-reefs-101/coral-reef-ecology/how-reefs-are-made/

Reefs are built by coral polyps as they secrete layers of calcium carbonate. The corals that build reefs are known as “hard” or “reef-building” corals.

Coral Polyps | Coral Reef Alliance

coral.org/coral-reefs-101/coral-reef-ecology/coral-polyps/

Coral reefs are built by and made up of thousands of tiny animals—coral “polyps” —that are related to anemones and jellyfish.

Coral Reef Facts and Information

www.coral-reef-info.com/

Facts and information about coral reefs; including reef structure, marine life, and distribution.

Answer
Coral reefs are underwater structures formed from the calcium carbonate secreted by corals.
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NOAA CoRIS - What are Coral Reefs

www.coris.noaa.gov

Dec 16, 2014 ... Coral reefs are unique (e.g., the largest structures on earth of biological origin) and ... Stony corals (scleractinians) make up the largest order of ...

What Are Coral Reefs? | Coral Facts - Live Science

www.livescience.com

Oct 8, 2013 ... Coral reefs are large underwater structures composed of the skeletons of coral, which are marine invertebrate animals.

Coral Reef - Kids Do Ecology

kids.nceas.ucsb.edu

LOCATION: Coral reefs are generally found in clear, tropical oceans. Coral reefs form in waters from the surface to about 150 feet (45 meters) deep because ...