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Coral reefs form when coral polyps produce hard skeletons on top of one another.
As they do this, they extend upward and outward from the coral colony center, living atop the old, dead skeleton they have created.

en.wikipedia.org/wiki/Coral_reef

This means that most modern coral reefs are less than 10,000 years old. As communities established themselves on the shelves, the ...

oceanservice.noaa.gov/education/kits/corals/coral04_reefs.html

NOAA Ocean Service Oceans Education: How Do Coral Reefs Form? ... directly from the shore, forming borders along the shoreline and surrounding islands.

aquaworld.com.mx/en/how-are-coral-reefs-formed

Jun 1, 2015 ... Have you ever wondered how are coral reefs formed? Coral reef formation is a unique natural phenomenon. It is a diverse ecosystem formed ...

www.coral-reef-info.com/coral-reef-formation.html

Coral reef formation involves a variety of processes operating at different spatial scales, and our discussion of how coral reefs are formed reflects that reality.

coral.org/coral-reefs-101/coral-reef-ecology/how-coral-reefs-grow

Free-swimming coral larvae attach themselves to submerged rocks or other hard surfaces at the edges of islands or continents to begin the process of forming ...

coral.org/coral-reefs-101/coral-reef-ecology/how-reefs-are-made

The coral polyps that build the reef survive by forming a symbiotic relationship with microscopic algae called zooxanthellae. The polyps offer the algae shelter ...

www.thoughtco.com/how-do-coral-reefs-form-2291791

Feb 23, 2016 ... Coral reefs are composed of animals called stony corals. Learn how reefs form and about the types of coral reefs.

www.marinebio.net/marinescience/04benthon/crform.htm

A stable year-round climate is common in the tropical marine environment. This means there are few environmental changes throughout the year and no real ...

.ask.com/youtube?q=How+Are+Coral+Reefs+Formed&v=qZFTtgcr_mc
Jun 3, 2013 ... From Polyp to Coral Jungle - Duration: 5:32. U.S. National Parks of the Pacific Islands 6,594 views · 5:32 · Coral Reefs - the importance and the ...