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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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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 ...

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 ...

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 ...

wwf.panda.org/about_our_earth/blue_planet/coasts/coral_reefs

Coral reefs are home to 25% of all marine life on the planet. In fact the variety of life supported by coral reefs rivals that of the tropical forests of the Amazon or ...

video.nationalgeographic.com/video/coral-reefs

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

news.nationalgeographic.com/2017/06/coral-reef-bleaching-global-warming-unesco-sites

Jun 23, 2017 ... World Heritage reefs will die of heat stress unless global warming is curbed, a new UN study finds.

coralreef.noaa.gov

Mar 6, 2017 ... The Coral Reef Conservation Program is a partnership between the NOAA Line Offices that work on coral reef issues. We bring together ...

oceanservice.noaa.gov/oceans/corals

Hidden beneath the ocean waters, coral reefs teem with life. Coral reefs support more species than any other marine environment and rival rainforests in their ...