THE DISTRIBUTION OF WATER 23 



4. Why are we more uncomfortable on moist hot days than on 



dry hot days? 



5. What happens if you hold a cold piece of glass in steam? 



6. What is fog? 



7. What are dew and frost and hail? 



8. How is hail formed? 



9. Why does the wind blow? 

 10. Define gravity. 



