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en.wikipedia.org/wiki/Coral_reef

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures ..... when ocean waters are warm, poor, clear and agitated, a fact which Darwin had already noted when he passed through Tahiti in 1842.

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

... Basic Facts About Coral Reefs. Fact Sheet ... of thousands of marine species. About one-third of all marine fish species live part of their lives on coral reefs.

www.coral-reef-info.com

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

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

LOCATION: Coral reefs are generally found in clear, tropical oceans. .... Surf the Internet for information about coral reefs and marine conservation organizations.

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.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.

www.conserve-energy-future.com/top-25-coral-reef-facts.php

Fact 2: A coral reef isn't a “thing,” it's actually a community of life that lives and thrives in one location. What we think of as the base of the reef (and what we see  ...

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.