366 



FIRST YEAE SCIENCE 



party slips into a crevasse, the others will be able to hold 

 him up and pull him out. 



A glacier, like a river, is found to flow fastest near the 

 middle and on top, and slowest at the bottom and on the 

 sides. The rate 'of motion in the Alpine glaciers varies 

 generally somewhere between 50 feet and one third of a 



THE COB GLACIER, MOUNT HOOD. 



mile in a year, being greatest in the summer and least in 

 the winter. 



Alpine glaciers are found not only, as the name would 

 indicate, in the Alps, but also in Norway, in the Himalayas, 

 among the higher mountains in the western United States, 

 on Mt. Shasta and in fact wherever the snow accumulates 

 in the mountain valleys year after year. 



As glaciers creep down the valleys, dirt and rocks fall 

 upon their edges from the upper valley sides and are 

 borne along upon the ice. If two glaciers unite to form a 

 larger one, the debris upon the two sides which come to- 



