1. Coral Reefs
They are massive underwater structures formed by the limestone skeletons of tiny invertebrate animals. ... The term "coral" applies both to these animals and to their skeletons, particularly the skeletons of stone-like corals (Discover 1997). ... In effect, the corals build limestone, because their skeletons are made of Calcium Carbonate. The skeletons deposited by these corals and other organisms accumulate, along with sand and other debris, to form the backbone of the reef. ... The location of the Florida Keys makes them particularly vulnerable. ...
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- Grade Level: High School