Coral reef facts

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What are coral reefs?
Coral reefs are colonies of micro creatures named pollups, little hair-like things that live on the top layer of the coral. The coral grows because when one generation dies they leave behind a hard, stony, branching structure made of limestone which later generations call home.
Reference: Animal Planet
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When is coral not a coral reef?
There are two types of coral, hard coral and soft coral. Hard coral species appear in reefs while soft coral species do not build reefs.
Reference: http://www.enchantedlearning.com/subjects/ocean/Coralreef.shtml
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