Article Report

Earth's Big Breakup

 

1) Why do scientists think the continents might have been part of one giant landmass at one time?

 

2) What is Pangaea, and how long ago did it exist?

 

 

3) Pangaea means ....

 

4) What do scientists look for as evidence of continental drift?

 

     a)

 

     b)

 

     c)

 

 

5) How does the first of the above support the theory of continental drift?

 

 

6) How does the first of the above support the theory of continental drift?

 

 

7) How does the first of the above support the theory of continental drift?

 

 

 

Look at the caption titled "HOW THE CONTINENTS MOVE"

8) To move a continent...

 

9) What happens at diverging plate boundaries on the ocean floor?

 

10) What pushes the crustal plates apart?

 

 

11) What is sea-floor spreading?

 

 

Look at the caption "HOW DO WE KNOW"

12) What are two techniques scientists have for measuring distances on the earth?

 

 

13) According to these measurements what is happening to the continents?

 

 

14)How do satellite pictures help scientists fit together the plate tectonics puzzle?