Figure 10.13

GEO-GRAPHIC: Three kinds of coral reefs. A fringing reef, a barrier reef, and an atoll may develop in sequence around a sinking volcanic island. Fringing reefs also form near mainland coasts. Barrier reefs form along mainland coasts as well, but are separated from the coast by open water.

(Photos from left to right: © Chad Ehlers/Photographer’s Choice/Getty Images; © Scott Winer/Oxford Scientific/Getty Images; NASA image created by Jesse Allen, using EO-1 ALI data provided courtesy of the NASA EO-1 Team)