REVIEW OF CHAPTER VI. 



Where do people obtain drinking water ? 



What is a spring ? Water flowing out of the ground. 



By what are springs formed ? Does all the rain sink into the 

 ground? What becomes of the rain? What is a well ? How are 

 wells usually made? If there were no rain or snow, would we 

 have wells and springs ? 



If air had no weight, would pumps raise water as they do now? 

 Does air press heavily on everything? // does. If you should 

 take the air away from a portion of any body of water, what would 

 be the result ? Water would rise at the place from which the air was 

 removed. 



Why does water or any liquid rise in a straw when you suck it ? 

 Because the air is removed from the spot enclosed by the straw. 



Why does water rise in a suction pump ? Because the air is 

 removed from within the pump. 



What presses the water upwards through the pump ? The air 

 resting on the water outside of the pump. 



What is an Artesian Well ? How is it made ? How deep have 

 some been bored? 



Do all wells and springs give fresh, cool water? Some give salt 

 water y some give warm water, and some give oil. 



Of what use is the oil which is obtained from wells ? Of what 

 use is the salt water? Salt is made from it by evaporation. (See 

 pages 17 and 18.) 



SPELLING AND WRITING EXERCISE. 



Write a composition on wells, springs and pumps ; enough to 

 fill one page of a copy-book or letter-paper. 



