Figure 19.10

Three kinds of beaches. (A) The coral reefs surrounding the Galápagos Islands create white beaches composed of broken fragments of the reefs. (B) The beaches on Bioko Island in Equatorial Guinea are composed of black sand because the parent material is basalt. (C) Beaches that are composed of gravel, pebbles, cobbles, or some combination of these materials are called shingle beaches. This shingle beach with cobbles is located in Pembrokeshire, Wales.

(A. © Ralph Lee Hopkins/National Geographic/Getty Images; B. © Tim Laman/National Geographic/Getty Images; C. © Tony Craddock/Science Source)