Formation of Soil. 



57 



FIG. 15. Show mg the shifting of river channels, the formation of "ox-bow - 

 and alluvial soils. 



73. Glacial Soils. In those portions of the world where 

 the temperature is so low that most of the moisture falls 

 as snow and where these snows do not all melt during the 

 warm season there come to be such vast accumulations thai 

 the great weight compresses the snow into ice. So ex- 

 tensive and massive are these snow and ice fields in Green- 



