WINDS AND STORMS 147 



Questions 



1. State three ways in which winds are of 

 importance. 



2. What is the principal cause of winds? 



3. What is the direction of the movement of air 

 over the equator and in the tropics? 



4. In what latitude does this air begin to settle 

 down on the surface of the earth? 



5. In what directions does the air move from the 

 regions of high pressure formed at 30 north and south 

 latitudes ? 



6. Why do not prevailing winds blow directly 

 north and south? 



7. Toward what direction are winds deflected in 

 the northern hemisphere? In the southern? 



8. What are the prevailing westerlies? 



9. What are the trade winds? 



10. What are land and sea breezes ? What causes 

 them? 



11. What are the characteristics of a cyclone ? An 

 anticyclone ? 



12. Under what conditions do thunderstorms arise? 



13. What is the cause of a rainbow ? 



14. How do you account for lightning? Thunder? 



15. Why do^sr.e hear thunder some time after we 

 have seen the lightning? 



16. How could we estimate the distance from the 

 earth to the clouds during a thunderstorm? 



17. What is a blizzard? 



18. Why are tornadoes so destructive? 



19. In what parts of the United States have we had 

 tornadoes? 



20. What is a water spout? 



