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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 ...

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 ...

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 ...

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.

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 ...

oceanservice.noaa.gov/education/kits/corals/coral07_importance.html

Coral reefs are some of the most diverse and valuable ecosystems on Earth. Coral reefs support more species per unit area than any other marine environment, ...

video.nationalgeographic.com/video/101-videos/coral-reefs-101

What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know about reefs and the tiny animals—polyps— that ...

www.nationalgeographic.com/animals/invertebrates/group/corals

Meet the tiny organisms that combine to create the world's great tropical reefs. Find out about the threats that imperil corals worldwide.