Download Earth Science Chapter 9 Section 3 Review

Name: ________________________ Class: ___________________ Date: __________
ID: A
Earth Science Chapter 9 Section 3 Review
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. Which of the following results when divergence occurs between two oceanic plates?
a. seafloor spreading
c. an ocean trench
b. a subduction zone
d. a volcanic island arc
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2. Typical rates of seafloor spreading are approximately ____.
a. 50 centimeters per year
c. 5 kilometers per year
b. 5 meters per year
d. 5 centimeters per year
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3. The Red Sea is theorized to be the site of a recently formed ____.
a. convergent boundary
c. divergent boundary
b. transform fault boundary
d. hot spot
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4. An example of a divergent plate boundary on continental lithosphere would be ____.
a. the Mid-Atlantic Ridge
c. the East African Rift Valley
b. East Pacific Rise
d. the Andes Mountains
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5. Which list places the locations in the correct sequence, with the initial seafloor spreading stage first, followed
by more advanced stages in the seafloor spreading process?
a. Red Sea, African Rift Valley, Atlantic Ocean
b. Atlantic Ocean, African Rift Valley, Red Sea
c. African Rift Valley, Atlantic Ocean, Red Sea
d. African Rift Valley, Red Sea, Atlantic Ocean
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6. What forms when one oceanic plate is forced beneath another plate?
a. an ocean basin
c. a subduction zone
b. an ocean ridge
d. a rift valley
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7. Deep ocean trenches are associated with ____.
a. ocean ridge systems
c.
b. subduction zones
d.
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transform fault boundaries
rift zones
Name: ________________________
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8. What feature is labeled B in Figure 9-1?
a. trench
b. ocean ridge
ID: A
c.
d.
volcanic island arc
continental volcanic arc
9. What process is illustrated by the area labeled G in Figure 9-1?
a. seafloor spreading
c. rifting
b. continental volcanism
d. subduction
____ 10. Which of the following does NOT occur at a subduction zone?
a. The leading edges of both plates are bent upward.
b. Oceanic crust is pushed down into the mantle.
c. A continental plate moves over an oceanic plate.
d. One oceanic plate moves beneath another oceanic plate.
____ 11. Oceanic lithosphere is destroyed at ____.
a. transform fault boundaries
b. divergent boundaries
c.
d.
ocean ridges
convergent boundaries
____ 12. The Himalayas in South Asia are an example of what type of plate boundary?
a. convergent oceanic-continental boundary
b. convergent continental-continental boundary
c. divergent boundary
d. transform fault boundary
____ 13. Volcanic island arcs are associated with what type of plate boundary?
a. divergent boundary
b. convergent continental-continental boundary
c. convergent oceanic-continental boundary
d. convergent oceanic-oceanic boundary
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Name: ________________________
ID: A
____ 14. Continental volcanic arcs are associated with what type of plate boundary?
a. convergent continental-continental boundary
b. convergent oceanic-continental boundary
c. transform fault boundary
d. convergent oceanic-oceanic boundary
____ 15. If a deep ocean trench is located adjacent to a continent, active volcanoes would likely be found ____.
a. seaward from the trench
c. at the ends of the trench
b. along the axis of the trench
d. landward from the trench
____ 16. Why are subduction zones not commonly found at convergent continental-continental boundaries?
a. Continental lithosphere is too buoyant to be forced down into the mantle.
b. Subduction zones are never found at convergent boundaries.
c. Oceanic lithosphere is too buoyant to be forced down into the mantle.
d. Continental lithosphere is too dense to be forced down into the mantle.
____ 17. What type of plate boundary is illustrated in Figure 9-2?
a. divergent boundary
b. convergent oceanic-continental boundary
c. convergent continental-continental boundary
d. convergent oceanic-oceanic boundary
____ 18. What feature is labeled A in Figure 9-2?
a. subduction zone
b. trench
c.
d.
____ 19. At a transform fault boundary, ____.
a. new oceanic crust is formed
b. oceanic lithosphere is destroyed
c. lithosphere is neither destroyed nor produced
d. new continental crust is formed
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volcanic island arc
continental volcanic arc
Name: ________________________
ID: A
____ 20. Where are most transform faults found?
a. in California
b. joining two segments of a mid-ocean ridge
c. joining two segments of a subduction zone
d. in areas where two continents have collided
Completion
Complete each statement.
21. ____________________ is the mechanism responsible for producing the new oceanic crust between two
diverging plates.
22. During the breakup of a continent along a divergent plate boundary, deep faulted structures called
____________________ are generated.
23. A subduction zone occurs when one ____________________ plate is forced beneath a second plate.
24. At a(n) ______________________________ boundary, oceanic lithosphere plunges beneath an overriding
continental plate.
25. A chain of small volcanic islands that forms when two oceanic plates converge, one descending beneath the
other, is called a(n) ____________________.
26. A(n) _________________________ occurs where two plates grind pass each other without creating or
destroying lithosphere.
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Name: ________________________
ID: A
Short Answer
27. Using what you know about plate boundaries, explain the tectonic movement that is occurring at the East
African Rift Valley, and predict how the area may change in the future.
28. Explain why divergent plate boundaries are also called constructive plate margins.
29. What features are common at convergent continental-continental boundaries? Give an example.
30. Describe what happens at transform fault boundaries, and include the geologic hazard that is associated with
this type of boundary on continental crust.
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ID: A
Earth Science Chapter 9 Section 3 Review
Answer Section
MULTIPLE CHOICE
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COMPLETION
21. ANS: Seafloor spreading
PTS: 1
22. ANS:
rifts
rift valleys
DIF: L1
OBJ: 9.7
PTS: 1
23. ANS: oceanic
DIF: L2
OBJ: 9.7
PTS: 1
DIF: L1
24. ANS:
convergent oceanic-continental
convergent oceanic continental
OBJ: 9.8
PTS: 1
DIF: L1
OBJ: 9.9
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ID: A
25. ANS: volcanic island arc
PTS: 1
DIF: L2
26. ANS: transform fault boundary
PTS: 1
DIF: L1
OBJ: 9.9
OBJ: 9.10
SHORT ANSWER
27. ANS:
The East African Rift Valley is undergoing spreading at a diverging plate boundary and, in the future, the rift
valley may continue to spread apart and may ultimately become an ocean basin.
PTS: 1
DIF: L2
OBJ: 9.7
28. ANS:
Divergent plate boundaries are called constructive plate margins because new ocean lithosphere is generated,
or constructed, at these boundaries.
PTS: 1
DIF: L2
OBJ: 9.8
29. ANS:
Complex mountain belts are common at convergent continental-continental plate boundaries, such as the
Himalayas, Appalachian Mountains, the Alps, and the Ural Mountains.
PTS: 1
DIF: L2
OBJ: 9.9
30. ANS:
At a transform fault boundary, two plates grind pass one another without creating or destroying lithosphere;
these boundaries can trigger major destructive earthquakes.
PTS: 1
DIF: L1
OBJ: 9.10
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