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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 ...

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...

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 ...

NOAA CoRIS - What are Coral Reefs

www.coris.noaa.gov/about/what_are/

Dec 16, 2014 ... What are Coral Reefs. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals ...

What Are Coral Reefs? | Coral Facts - Live Science

www.livescience.com/40276-coral-reefs.html

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

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.

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 - MarineBio.org

marinebio.org/oceans/coral-reefs/

Coral reefs are a precious resource in the ocean because of their beauty and biodiversity. Coral reefs provide shelter for a wide variety of marine life, they ...

Coral Reefs - Kids Do Ecology

kids.nceas.ucsb.edu/biomes/coralreef.html

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 ...

Coral Reefs - National Geographic

video.nationalgeographic.com/video/coral-reefs

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

Answers
coral reef
NOUN
1.
a reef composed mainly of coral and other organic matter of which parts have solidified into limestone.
Source: Dictionary.com
coral reefs | Define coral reefs at Dictionary.com
dictionary.reference.com/browse/coral reefs
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