WEATHER 185 



5. Name the ways in which the air serves us. 



6. What becomes of the fog as it disappears on a foggy morn- 

 ing? 



7. Why is it cold on the mountain tops even in tropical 

 countries? 



8. Why does air laden with dust become heated more rapidly 

 than clean air? 



9. Why should fruit trees be planted on the higher ground 

 rather than in the valleys ? 



10. How is air heated? 



11. How does the shape of the earth affect the distribution of 

 temperature ? 



12. How do clouds prevent the formation of dew and frost? 



13. Why does covering a plant with paper or cloth prevent it 

 from being frostbitten? 



14. What kind of soil is best for absorbing heat? 



15. What is the effect of large bodies of water on the climate 

 of a region? 



16. What is the relation of trade winds to rainfall? 



17. Will the pressure in an ascending column of air be low or 

 high? 



18. Does moisture in the air make the air heavier? Why? 



19. What is relative humidity? How may it be determined ? 



20. Is it correct to say that snow is frozen rain? 



21. What is the difference between a fog and a cloud? 



22. Define meteorology. 



23. How does humidity vary with the temperature? 



24. Where is the heaviest rainfall in the United States? 



