Earth Science Honors
Plate Tectonics Intermediate
Name ________________________
Block______
Sheet 3 Parts 7-10
#7 Divergent Plate Boundaries
1. Where are most divergent plate boundaries located?
2. As plates move apart, the gap is filled with ____________ ___________ that oozes up from the hot
_______________ below.
3. What mechanism has created the floor of the Atlantic Ocean during the last 160 million years?
4. _____________ The average rate of sea floor spreading.
5. ______________ According to the diagram on screen 207, what is the rate of spreading closest to us
here in Virginia?
6. ______________ According to the text inside screen 208, none of the ocean floor that has been
dated exceeds how many years in age?
7. What is continental rifting?
8. Where does continental rifting occur?
9. What is a rift valley?
10. Give an example of a modern rift valley system.
11. How did the Red Sea form?
Complete the computer review questions on screens 219-226.
#8 Convergent Plate Boundaries
12. What happens to older slabs of oceanic lithosphere?
PT Sheet 3 Parts 7-10
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13. List 3 ways convergent boundaries form.
1.
2.
3.
14. What happens when an oceanic slab converges with a continental lithosphere? (234)
15. What is a subduction zone?
16. How is a deep oceanic trench produced? (236)
17. What happens when the oceanic slab descends to roughly 100 km?
18. How does the subduction of a cool slab of oceanic lithosphere cause mantle rock to melt?
19. How does a continental volcanic arc form?
20. Name an active continental volcanic arc located in the western United States?
21. Describe the eruption of a volcano found in this area?
22. What happens when 2 plates composed of oceanic lithosphere converge?
PT Sheet 3 Parts 7-10
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23. How does a volcanic island arc form?
24. Where are most volcanic island arcs located?
25. Name the 2 volcanic island arcs located in the Atlantic Ocean.
1.
2.
26. On screen 254 click on the News Flash area. How many people were killed in St. Pierre when Mt.
Pelee erupted in 1902?
27. What happens when 2 continental crusts collide?
28. Which mountains are forming as India “rams” into Asia?
29. __________________ How long ago did India separate from Pangaea?
30. __________________ How long ago did India reach the trench along the southern margin of Asia?
31. __________________ Mountain range in the United States formed in the past by collision of large
continental blocks.
Answer the computer review questions on screens 265-276. You may see these again….
#9 Transform Plate Boundaries
32. Transform faults occur where plates ____________ _____________ past one another … without
generating new lithosphere as occurs along _____________ __________________... and without
the destruction of lithosphere as occurs along ______________ ______________.
33. What do most transform faults join?
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34. (Screen 285) What does the grinding of plates past one another cause?
35. (Screen 288) What does the Mendocino Fault connect?
36. Describe the plate motion along the San Andreas Fault.
37. What will happen in the future if the San Andreas Fault continues along its current path?
Answer the computer review question on screens 297-301. You may see these questions again….
#10 A Closer Look at Plate Boundaries
Complete the computer activities from screens 304-342, then print your score for a grade. DO NOT USE “I
GIVE UP” or your grade will reflect this.
PT Sheet 3 Parts 7-10
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