This reference describes the relationship between reef formation and sea level, how it can be used to detect ancient changes in sea level, and how it might be used to predict the results of future increases in sea level. Topics include the coral environment, how reefs respond to changes in sea level, and how limestone forms. There is also an activity in which students use maps of present and past shorelines, bathymetry, and reef locations to predict where Florida’s reefs might form in the future.