Section+Two


 * How is Continental Movement Explained by Plate Tectonics?**

__Sonar:__
 * Vocabulary**

__Seafloor Spreading:__

__Plate Tectonics:__

__Spreading Boundary:

Fracture Boundary:

Colliding Boundary:__

1. When did scientists first start looking at the ocean floor for evidence of continental drift?

2. What had Wegener been wrong about?

3. How do scientists use sonar to make a map of the ocean floor?

4. What did scientists find out about the age of the ocean floor?

5. Where is the youngest crust located?

6. What is the difference between lava and magma?

7. What does tectonics mean?

8. Which plate boundary makes new crust?

9. When did the Atlantic Ocean begin to form?

10. How fast do the two plates along the San Andreas Fault move past eachother?

11. When will Los Angeles and San Francisco be right next to eachother?

12. What two formations are found at colliding boundaries?

13. Why don't the continents sink into the mantle?


 * Lesson Review Questions from page 326**

1. How did scientists find out that the ocean floor is spreading in some places?

2. How does the theory of plate tectonics explain the movement of continents?

3. What three ways can plates move?

4. Challenge! How does the earth stay the same size if new crust is formed at spreading boundaries?

Find Out On Your Own


 * Glomar Challenger**

http://en.wikipedia.org/wiki/Glomar_Challenger http://www-odp.tamu.edu/glomar.html http://pubs.usgs.gov/gip/dynamic/glomar.html http://geology.about.com/cs/escibasics/a/aa101203a.htm http://books.google.com/books?id=ZExIeZy6MFUC&pg=PA212&lpg=PA212&dq=glomar+challenger&source=web&ots=NsDe8Vln2J&sig=NySJRvnXhCv5J4JdSoYpQODKVY4#PPP1,M1 1. What problems did scientists have as they drilled into the ocean floor?

2. What special instruments did scientists use to solve these problems?

3. What kinds of data can the Glomar Challenger gather?