.>w.:-:<-.:,^s^---- 

 filiill 



Figure 77 — Columbia Glacier, a piedmont glacier, Prince William Sound, Alaska. 

 Calving into- tide water, the piedmont lobe is shrinking rapidly. (Bradford 

 Washburn. ) 



Figure 78 — Ice cliff formed from shelf ice on the right meeting the sea. On the left 

 are small floes, blocks, and brash. Calving is in preparation along the crevasse 

 at the right. 



69 



