116 



PHYSIOGRAPHY 



the ground becomes united to the ice in the soil. This union is 

 brought about, in part at least, by the freezing of descending water. 



Fig. 118. A glaciated mountain valley; Uinta Mountains. 



After this has taken place, further movement causes some of the 

 soil to be carried forward by the ice. 



Fig. 119. A mountain valley in the same range as the last, but not glaciated. 



A glacier, therefore, cleans off the loose debris from the surface 

 (Fig. 116), and breaks or wears off projecting points of the surface 



