REVIEW QUESTIONS 69 



Review Questions, 15, 



1. What makes the sun appear red and large at sun- 

 rise and sunset? Does the sun really change its color 

 and size? 



2. What causes the sky to be light blue on some 

 days arid dark blue on other days? 



3. When you pour hot water into a glass dish the 

 inside expands before the heat reaches the outside. What 

 happens? Is glass a good conductor of heat? Do you 

 think thin glass would break? 



4. What is friction? How can you make friction 

 much less than it would be if you did nothing? 



5. Why do we build a fire by first putting in paper, 

 then little pieces of wood, and finally large pieces of 

 wood, or perhaps coal? 



6. What must be done if the clothing is on fire? 



7. What is the most common remedy for burns? 



8. Why do linen sheets feel cold when we first get 

 into bed? 



9. How does the teakettle become warm when on 

 top of the stove? 



10. Why do firemen wear woolen shirts? Give two 

 reasons. 



