EROSION 



495 



protective coverings and binding materials may be kept 

 on the soil. The most effective of these are fine-rooted 

 crops, which not only hold the soil togther, but protect 

 It against the force of the water. In those sections where 



Fig. 153. Characteristic erosion of loess. The binding power of roots is illus- 

 trated by the tree roots at the surface. 



