1. Unit 3 – Dynamic Crust Review
Miss Wojdan

2. Which mantle hot spot is located directly below a mid-ocean ridge plate boundary?
A. Yellowstone
B. Iceland
C. Canary Islands
D. Hawaii

3. Which mantle hot spot is located directly below a mid-ocean ridge plate boundary?
A. Yellowstone
B. Iceland
C. Canary Islands
D. Hawaii

4. The Explorer Ridge is the boundary between the Explorer Plate and which other plate?
A. North American
B. Pacific Plate
C. Juan de Fuca Plate
D. Gorda Plate

5. The Explorer Ridge is the boundary between the Explorer Plate and which other plate?
A. North American
B. Pacific Plate
C. Juan de Fuca Plate
D. Gorda Plate

6. Compared to the oceanic crust, the continental crust is
A. Less dense and more felsic
B. Less dense and more mafic
C. More dense and more felsic
D. More dense and more mafic

7. Compared to the oceanic crust, the continental crust is
A. Less dense and more felsic
B. Less dense and more mafic
C. More dense and more felsic
D. More dense and more mafic

8. The Aleutian Islands extend westward from Southern Alaska to form the northern boundary of the Pacific Ocean. These volcanic islands were formed by the nearby
A. Divergence of a continental plate
B. Divergence of an oceanic plate
C. Subduction of a continental plate
D. Subduction of an oceanic plate

9. The Aleutian Islands extend westward from Southern Alaska to form the northern boundary of the Pacific Ocean. These volcanic islands were formed by the nearby
A. Divergence of a continental plate
B. Divergence of an oceanic plate
C. Subduction of a continental plate
D. Subduction of an oceanic plate

10. The greatest earthquake hazard to homes exists when they are built on
A. Hard igneous rock
B. Sedimentary rock
C. Coarse sediments
D. Silt and mud

11. The greatest earthquake hazard to homes exists when they are built on
A. Hard igneous rock
B. Sedimentary rock
C. Coarse sediments
D. Silt and mud

12. Earth’s internal heat is the primary source of energy that
A. Warms the lower troposphere
B. Melts glacial ice at lower latitudes
C. Moves the lithospheric plates
D. Pollutes groundwater with
radioactivity

13. Earth’s internal heat is the primary source of energy that
A. Warms the lower troposphere
B. Melts glacial ice at lower latitudes
C. Moves the lithospheric plates
D. Pollutes groundwater with
radioactivity

14. P-Waves arrive at a seismic station at 2:33 p. m
P-Waves arrive at a seismic station at 2:33 p.m. The station is 2,200 km away from the epicenter. What time did the earthquake occur?
A. 02:26:40 p.m.
B. 02:28:40 p.m.
C. 02:30:10 p.m.
D. 02:37:20 p.m.

15. P-Waves arrive at a seismic station at 2:33 p. m
P-Waves arrive at a seismic station at 2:33 p.m. The station is 2,200 km away from the epicenter. What time did the earthquake occur?
A. 02:26:40 p.m.
B. 02:28:40 p.m.
C. 02:30:10 p.m.
D. 02:37:20 p.m.

16. 8. The arrival time of the first earthquake P- wave at a seismograph station was 10:11:20 (hours: minutes: seconds). If the epicenter of the earthquake is 8000 km away, what was the approximate arrival time of the first S- wave from this earthquake? A. 10:02:00 B. 10:09:20 C. 10:20:40 D. 10:32:00

17. 8. The arrival time of the first earthquake P- wave at a seismograph station was 10:11:20 (hours: minutes: seconds). If the epicenter of the earthquake is 8000 km away, what was the approximate arrival time of the first S- wave from this earthquake? A. 10:02:00 B. 10:09:20 C. 10:20:40 D. 10:32:00

18. The MOHO is a boundary located in zone:
A. A
B. B
C. E
D. D

19. The MOHO is a boundary located in zone:
A. A
B. B
C. E
D. D

20. What type of plate boundary is shown?
A. Divergent
B. Convergent
C. Transform
D. Complex

21. What type of plate boundary is shown?
A. Divergent
B. Convergent
C. Transform
D. Complex

22. The temperature of the asthenosphere at the depth where melting first takes place is
B. 1,300 ⁰C
C. 4,200 ⁰C
D. 5,000 ⁰C

23. The temperature of the asthenosphere at the depth where melting first takes place is
B. 1,300 ⁰C
C. 4,200 ⁰C
D. 5,000 ⁰C

24. 12. Which part of this seismogram is used to find the distance to the epicenter of the earthquake?
A. P-Wave arrival time, only
B. S-Wave arrival time, only
C. Difference in arrival time of the P- and
S-Wave
D. Difference in height of the P- and S-Wave

25. 12. Which part of this seismogram is used to find the distance to the epicenter of the earthquake?
A. P-Wave arrival time, only
B. S-Wave arrival time, only
C. Difference in arrival time of the P- and
S-Wave
D. Difference in height of the P- and S-Wave

26. The most recently formed bedrock is found at location
A. A
B. B
C. C
D. D

27. The most recently formed bedrock is found at location
A. A
B. B
C. C
D. D

28. 14. Which block diagram best represents the relative direction of plate motion at the San Andreas Fault? A. B. C. D.

29. 14. Which block diagram best represents the relative direction of plate motion at the San Andreas Fault? A. B. C. D.

30. Which letter best represents Earth’s mantle?
A. Q
B. B
C. C
D. D

31. Which letter best represents Earth’s mantle?
A. Q
B. B
C. C
D. D

32. 16. The first S-wave arrived at a seismograph station 11 minutes after an earthquake occurred. How long after the arrival of the first P-wave did this first S-wave arrive? A. 3 minutes 15 seconds B. 4 minutes 55 seconds C. 6 minutes 05 seconds D. 9 minutes 00 seconds

33. 16. The first S-wave arrived at a seismograph station 11 minutes after an earthquake occurred. How long after the arrival of the first P-wave did this first S-wave arrive? A. 3 minutes 15 seconds B. 4 minutes 55 seconds C. 6 minutes 05 seconds D. 9 minutes 00 seconds

34. At which plate boundary is one lithospheric plate sliding under another?
A. Nazca Plate and Antarctic Plate
B. Nazca Plate and Pacific Plate
C. Pacific Plate and Indian-Australian
D. Indian-Australian and Antarctic
Plate

35. At which plate boundary is one lithospheric plate sliding under another?
A. Nazca Plate and Antarctic Plate
B. Nazca Plate and Pacific Plate
C. Pacific Plate and Indian-Australian
D. Indian-Australian and Antarctic
Plate

36. Alternating parallel bands of normal and reversed magnetic polarity are found in the basaltic bedrock on either side of the
A. Mid-Atlantic Ridge
B. Yellowstone Hot Spot
C. San Andreas Fault
D. Peru-Chile Trench

37. Alternating parallel bands of normal and reversed magnetic polarity are found in the basaltic bedrock on either side of the
A. Mid-Atlantic Ridge
B. Yellowstone Hot Spot
C. San Andreas Fault
D. Peru-Chile Trench

38. Which combination of temperature and pressure is inferred to occur within Earth’s stiffer mantle?
A. 3,500 ⁰C and 0.4 million atmospheres
B. 3,500 ⁰C and 2.0 million atmospheres
C. 5,500 ⁰C and 0.4 million atmospheres
D. 5,500 ⁰C and 2.0 million atmospheres

39. Which combination of temperature and pressure is inferred to occur within Earth’s stiffer mantle?
A. 3,500 ⁰C and 0.4 million atmospheres
B. 3,500 ⁰C and 2.0 million atmospheres
C. 5,500 ⁰C and 0.4 million atmospheres
D. 5,500 ⁰C and 2.0 million atmospheres

40. Which part of the Earth’s interior is inferred to have convection currents that cause lithospheric plates to move?
A. Crust
B. Asthenosphere
C. Outer Core
D. Inner Core

41. Which part of the Earth’s interior is inferred to have convection currents that cause lithospheric plates to move?
A. Crust
B. Asthenosphere
C. Outer Core
D. Inner Core

42. 21. An earthquake’s first P-wave arrives at a seismic station at 12:00:00. This P-wave has traveled 6,000 kilometers from the epicenter. At what time will the first S-wave from the same earthquake arrive at the seismic station? A. 11:52:20 B. 12:07:40 C. 12:09:20 D. 12:17:00

43. 21. An earthquake’s first P-wave arrives at a seismic station at 12:00:00. This P-wave has traveled 6,000 kilometers from the epicenter. At what time will the first S-wave from the same earthquake arrive at the seismic station? A. 11:52:20 B. 12:07:40 C. 12:09:20 D. 12:17:00

44. 21. An earthquake’s first P-wave arrives at a seismic station at 12:00:00. This P-wave has traveled 6,000 kilometers from the epicenter. At what time will the first S-wave from the same earthquake arrive at the seismic station? A. 11:52:20 B. 12:07:40 C. 12:09:20 D. 12:17:00

45. The seismogram recorded at Station A would show the
A. Arrival of P-Waves, only
B. Earliest arrival time of P-Waves
C. Greatest difference in arrival times
between the P- and S-Waves
D. Arrival of S-Waves before the arrival of
P-Waves

46. The seismogram recorded at Station A would show the
A. Arrival of P-Waves, only
B. Earliest arrival time of P-Waves
C. Greatest difference in arrival times
between the P- and S-Waves
D. Arrival of S-Waves before the arrival of
P-Waves

47. 23. A seismic station is recording the seismic waves produced by an earthquake that occurred 4200 kilometers away. Approximately how long after the arrival of the first P-wave will the first S-wave arrive? A. 1 minute 05 seconds B. 5 minutes 50 seconds C. 7 minutes 20 seconds D. 13 minutes 10 seconds

48. 23. A seismic station is recording the seismic waves produced by an earthquake that occurred 4200 kilometers away. Approximately how long after the arrival of the first P-wave will the first S-wave arrive? A. 1 minute 05 seconds B. 5 minutes 50 seconds C. 7 minutes 20 seconds D. 13 minutes 10 seconds

49. What are the most likely geologic ages of volcanoes B and D?
A. B is 5 million years old and D is 12 million
years old
B. B is 2 million years old and D is 6 million
C. B is 9 million years old and D is 9 million
D. B is 10 million years old and D is 4 million

50. What are the most likely geologic ages of volcanoes B and D?
A. B is 5 million years old and D is 12 million
years old
B. B is 2 million years old and D is 6 million
C. B is 9 million years old and D is 9 million
D. B is 10 million years old and D is 4 million