112 EXPERIMENTAL GENERAL SCIENCE 



15. What wind blows before a storm in your region? 



16. Why are summer thunder storms most likely to occur after the 

 sun has begun to go down? 



17. Why is it foggy in the North Atlantic in the vicinity of icebergs? 



18. Explain the "banner cloud" that often streams away from a 

 mountain top opposite the side from which the wind is blowing. 



FIG. 36. Banner-cloud diagram. 



19. Why does little rain fall in the Sahara Desert when moist winds 

 from the Mediterranean Sea often blow over it? 



20. Why can you "see your breath" on a cold day? 



21. Why is fog more frequent in river valleys and along large bodies 

 of water than elsewhere? 



22. Explain the formation of the cloud which sometimes appears over 

 burning building. 



23. Why is fog more likely to form near cities than in the country? 



