Editing Coral reef (section)

===Material===
As the name implies, coral reefs are made up of coral skeletons from mostly intact coral colonies. As other chemical elements present in corals become incorporated into the calcium carbonate deposits, [[aragonite]] is formed. However, shell fragments and the remains of [[coralline algae]] such as the green-segmented [[genus]] ''[[Halimeda]]'' can add to the reef's ability to withstand damage from storms and other threats. Such mixtures are visible in structures such as [[Eniwetok Atoll]].<ref name=murph>{{cite book |title=Coral Reefs: Cities Under The Seas |last=Murphy |first=Richard C. |year=2002 |isbn=978-0-87850-138-0 |publisher=The Darwin Press |url={{google books |plainurl=y |id=WyYVAQAAIAAJ}}}}</ref>{{page needed|date=November 2022}}