Briefly describe three major types of coral reefs and discuss how each of these are formed.
The three types of reef are fringing, barrier and atoll with all reefs starting as fringing. Fringing are the most simple reef forms, growing on the edge of the land and growing outward. Consists of a reef flat (inner) and a reef slope (outer). A barrier reef is formed as coastal land is flooded by rising sea levels. Grow as fringing reef on former coastal hills and reefs, and are much larger than fringing reefs. Atolls are fringing reefs subsiding around volcanic islands