152 



WORK OF SNOW AND ICE 



Ice-caps which overspread the surface irrespective of valleys 

 and hills tend to reduce angularities of surface. Hills and ridges 

 are cut down and smoothed (Figs. 152 and 153); but since valleys 



Fig. 150. Contrast between a glaciated rock surface below, and non-glaciated 

 crests above. Kearsarge Pinnacles, Bubbs Creek Canyon, Cal. 



parallel to the direction of movement are deepened at the same 

 time, it is doubtful if the relief is commonly reduced by the erosion 

 of an ice-cap. 



Fiords. A valley glacier descending to the sea may gouge out 



Fig. 151. A hanging valley near Lake Kootenay. (Photo, by Atwood.) 



