GLACIERS 



201 



FIG. 210. The spreading end of a glacier, Alaska. (Brabazon.) 



day, occasion the relatively rapid melting of the ice below. 

 Depressions known as dust wells result. Miniature dust wells 

 may often be seen in rapidly melting snow banks. Summer 



FIG. 211. The Malaspina Glacier, and numerous valley glaciers. (Copy- 

 right by Univ. of Wis.) 



