72 



ELEMENTS OF AGRICULTURE 



a 



a 1 



CHAPTEE XIV.— Classification of Soils 



73. Transported Soils. — Soils seldom remain just 

 where they are formed, for the same forces that form 

 them also move them about. Water, the chief soil 

 former, is also the chief soil transporter. Its 

 ^ action in moving soils has been already men- 



tioned in Chapter III under erosion, and 

 may be better understood by reference 

 \ to Fig. 11, page 72. This figure is in- 

 tended to represent a section of a 

 rocky hill or mountain, and shows 

 how the top has been worn away 

 to form soil, which is moved 

 into the valley below. The 

 f dotted line ah 



IS 



SI A < ^/ V > S *_j >j /v. 



V A A( , H^l^ u^^^fe* -f clotted line aft 



Fig. 11.— Erosion of hill or mountain side. The soil between the lines 

 ah and a'b has been washed away, c shows coarse fragments ; /, finer 

 soil ; s, stream. 



shows the original shape of the hilltop; a'b its present 

 shape. The portion between ah and a'b has been grad- 

 ually worn away by frost and rain, and the particles 

 washed by rain to the more level land below. The coarse 

 fragments are the first to stop, and -as the ground be- 

 comes more level the finer particles are deposited from 



