FORMS OF WATER IN THE ATMOSPHERE 25 



current of air from the north which cools the moist warm air 

 coming from the ocean. 



Mist. There are times when the air is filled with a mist, or 

 particles larger than those of fog, and yet not as large as rain drops. 

 This mist may be due to the particles of fog being blown together 

 until the drops become so large that they sink toward the earth. 



QUESTIONS 



1. Why do people say that "dew falls"? 



2. At what time of day does the greatest amount of dew form? 

 Why? 



3. At what time of year do the heaviest dews occur ? Why? 



4. Why does an electric fan in a store window prevent frost 

 or mist forming on the window? 



5. Where do the automobile tires, shoes, clothing, machines 

 and other articles which we use go when they "wear out"? 



6. At what time of year is a hazy atmosphere most frequent? 

 Why? 



7. When will "hoar frost" form? 



8. What causes fog to appear to "lift"? 



9. Why do farmers feel no concern about frost on a cloudy 

 night? On a windy night? 



10. What makes the inside of a safe " sweat " on a warm sultry 

 day? 



11. What makes ice pitchers, cold water pipes, etc., "sweat"? 



12. Why does ice appear to " steam "? 



13. Why is there often a fog around an iceberg? 



14. Why do eyeglasses become covered with moisture when 

 brought into a warm room from a cold atmosphere? 



15. What becomes of the " cloud of steam " from a kettle of 

 boiling water? 



16. What causes the white cloud from the smokestack of a 

 locomotive? 



FORMS OF WATER IN THE ATMOSPHERE 



Clouds. Fog or mist may be called nothing more than a cloud 

 resting on the earth. Moist warm air rising high above the surface 

 pf the earth cools off as it reaches the higher levels. The water then. 



