CONSERVATION OF THE SOIL 



SOIL EROSION ' 



52. Soil erosion is the washing away of the soil by rain and 

 snow. It is prevented by proper crop rotation and by keeping 

 all ditches filled with rock or brush or some other substance. 



ERODED FIELD 

 EXERCISE 



1. Ordinary sandstone will hold - 1 - of its bulk of water. 

 How many gallons of water are there in a bed of sandstone 

 underlying a 5-acre field, if it is 10 ft. thick and soaked 

 with water ? 



45 



