1 6 THE SOIL AND SOIL WATER 



Water not at Rest. During rain, or whenever the 

 surface soil is wetter than the soil below, the water passes 

 down into the soil until it reaches a layer that it can not 

 pass, or until the upward current again begins; the water 

 in the soil is seldom at rest. In many places, there is a 

 surplus of water deep d<5wn in the soil, which flows into 

 wells or flows out in certain places as springs. 



QUESTIONS AND EXERCISES. 



1. What force causes a liquid to rise through a porous 

 substance? 



2. What is the free, or gravitational, water of the soil? 

 What is the capillary water? 



3. Under what conditions will soil water evaporate most 

 rapidly? 



4. Write in your notebook five important facts learned 

 in this lesson. 



