Figure 17.18

Rock debris on glaciers. Valley glaciers typically accumulate a heavy load of rock debris as they flow through steep-walled valleys. These dark stripes on the Kaskawulsh Glacier in Kluane National Park, Yukon, Canada, are composed of rocks ranging in size from small particles of sand to large boulders. Arrows show the direction of ice flow.
(© F. Barbagallo/De Agostini Picture Library/Getty Images)