j 68 ELEMENTARY SCIENCE 



QUESTIONS 



1. Why is it colder on mountain tops than on plains? 



2. Why is it colder at the north pole than at the equator? 



3. Explain the thermos bottle. 



4. In what ways is heat transferred? 



5. How does heat travel from the sun to the earth? 



6. What keeps us warm on summer nights? 



7. Why is there much greater variation in temperature between 



day and night in the Desert of Sahara than there is in most 

 other places? 



8. What is the cause of the seasons? 



9. How does the air get most of its heat? 



