102 GENERAL SCIENCE 







STREAMS, VALLEY FORMATION, AND SURFACE EROSION 



Into the lives of those whose childhood days are spent 

 near beautiful rivers or smaller streams there comes much 

 of pleasure and of education denied to others less happily 

 situated. Aside from the sports of fishing, rowing, skating, 

 and swimming, the variations in surface forms that are an 



FIG. 36. A stream in mid- winter. 



accompaniment of such streams enrich the experiences of 

 life, and make possible a clearer understanding of the geo- 

 graphic and economic conditions of other regions of the earth. 

 There will be a variety in the landscape due to differences 

 in land elevations, and the occupations of the people will be 

 varied because of the different natural conditions existing 

 in a region of irregular surfaces. 



Any study of the history of the United States goes hand 



