198 ELEMENTARY SCIENCE 



done, the wind may reach a velocity of four or five hundred 

 miles per hour. 



QUESTIONS 



1. Why are rain and snow useful to man? 



2. Why is there more rain in Oregon and Washington than in 



California? 



3. Why is the Great Basin so dry? 



4. Explain cyclones. 



5. Explain the relation of rain to areas of low pressure and high 



pressure. 



6. Why is there so much rain in the Mississippi Valley? 



7. What is heat lightning? 



8. What are the various kinds of clouds? 



9. What are tornadoes? 



