26 



AGRONOMY 



Photograph from Amer.cau stttl auil Wire Co. 



FIG. 11. A small pond nearly filled with aquatic vegetation 



Sedentary soils. Sedentary soils are formed from the under- 

 lying rock, either by decomposition, disintegration, or In ;i 

 combination of both. In limestone regions the soluble part 

 of the rock may be carried away by the water, leaving a soil 



