Earth Science
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Chapter 12 Test
Form C
Missed Vocab- Go to: http://quizlet.com/253154/mr-d-esch12-flash-cards/
Earthquake Problems (2pts each)
1. A P-wave leaves an earthquake in Albuquerque NM at 12:11PM. It travels 3000km to a seismic
station in Chicago, IL. What time (Albuquerque time) does it arrive in Chicago?
2. An earthquake arrives in Rochester, NY. The P-wave arrives there at 9:27 AM and the S-wave
arrives at 9:30:40 AM (that’s 9:30 and 40 seconds). How far away from Rochester did the
Earthquake occur?
3. How many seismic stations are needed to find the location of an earthquake? Why?
4. An S-wave traveled for 9 minutes and 40 seconds to a seismic station in Austin, TX. How far did
the S-wave travel?
5. If a P-wave traveled 6,000 km to a seismic station in Walla-Walla, Washington, how long does it
take the S-wave to arrive?
Multiple Choice – Please choose the best answer choice for each question. (1pt each)
Questions 1-3 refer to the following diagram:
The map below shows the continents of
Africa and South America, the ocean
between them, and the ocean ridge and
transform faults. Locations A and D are on
the continents. Locations B and C are on the
ocean floor.
_____1. The youngest age rock would most
likely be found at which location?
A.
A
B.
B
C.
C
D.
D
____2. Which graph best shows the relative
age of the ocean-floor bedrock from location
A to location D?
_____3.Which table best shows the relative
densities of the crustal bedrock locations at
A,B,C, and D?
Question 4 refers to the following:
The map below shows the Peru-Chile trench
_____4. In which diagram do the arrows
best represent the motions of Earth’s crust at
the Aleutian trench?
____5. The Marina trench marks the
boundary between the
A. Caribbean Plate and the Scotia
Plate
B. North American Plate and the
Cocos Plate
C. Phillippine Plate and the Pacific
Plate
D. Nazca Plate and the South
American Plate
Questions 6-8 refer to the following diagram:
The map below shows the location of mid-ocean ridges and the age of some oceanic bedrock
near these ridges. Letters A through D are locations on the surface of the ocean floor.
_____6. Rising convection currents in the asthenosphere would most likely be under location
A. A
B. B
C. C
D. D
_____7. What is the most probable age, in millions of years, of the bedrock at location C?
A. 62
B. 52
C. 0
D. 34
_____8. The age of oceanic bedrock on opposite sides of a mid-ocean ridge is supporting
evidence that at the ridges, tectonic plates are
A. locked in place
B. converging
C. being subducted
D. diverging
_____9. Volcanic activity like that which produced the Galapagos Islands is usually closely
correlated with
A) nearness to the center of the ocean
B) location of a magma hot spot
C) sudden reversals in the Earth's magnetic field
D) frequent major changes in climate
_____10. At which depth below the Earth’s surface is the density most likely 12.9 grams per
cubic centimeter?
A) 1500 km
C) 3500 km
B) 2000 km
D) 5800 km
Use the diagram below to answer questions 11-13. The diagram shows some features of
Earth's crust and upper mantle.
_____11. Which model most accurately shows the movements (arrows) associated with the
surface features shown in the diagram?
_____12.Based on the diagram and your Earth Science Reference Table, which of the following
pairs of plates is represented in the diagram.
A. South American Plate and African Plate
B. Antarctic Plate and Indian-Australian Plate
C. Pacific Plate and Eurasian Plate
D. Arabian Plate and African Plate
_____13. Based on the diagram, what type of plate boundary is causing the mid-ocean ridge?
A. Divergent
B. Convergent
C. Transform
D. Complex/Uncertain
Questions 14 through 17 refer to the following:
14. ___Which of the Hawaiian islands has the greatest probability of having a volcanic eruption?
A) Kauai
C) Maui
B) Hawaii
D) Oahu
15. _____Which graph best represents the ages of the Hawaiian Islands comparing them from
point B to point A.
16.____ If each island formed as the crustal plate moved over the magma source in the mantle as shown
in diagram II, where would the next volcanic island likely form?
A) southeast of Hawaii
C) northeast of Hawaii
B) northwest of Kauai
D) between Hawaii and Maui
17. ____ Crustal movement along the San Andreas fault is associated with a
A) Convergent boundary
C) Divergent boundary
B) sudden reversal in the Earth’s magnetic field
D) Transform boundary
Use the cross-sectional diagram below showing the paths of seismic waves from an earthquake to answer
question 18. Letter X represents the location of a seismic station.
18.____Which statement best explains why the shadow zone received no waves?
A) A liquid zone within the earth stops S-waves and refracts P-waves
B) P-waves and S-waves are refracted by the Earth’s core
C) Station X is too far from the focus for S-waves to reach
D) S-waves traveled too slowly for seismographs to detect them
19. Two geologic surveys of the same area, made 50 years apart, showed that the area had
been uplifted 5 centimeters during the interval. If the rate of uplift remains constant, how
many years will it take for this area to be uplifted a total of 50 centimeters?
A) 500 years
C) 350 years
B) 250 years
D) 700 years
20. A large belt of mountain ranges and volcanoes surrounds the Pacific Ocean. Which
events are most closely associated with these mountains and volcanoes?
A) earthquakes
C) hurricanes
B) sandstorms
D) tornadoes
21. Shallow-water fossils are found in rock layers that are at the top of mountain ranges.
This suggests that:
A) the surface water cooled off, killing the organisms.
B) shallow-water organisms always migrate to the deeper waters to die
C) parts of the ocean floor have subsided
D) parts of the ocean floor have been uplifted
22. Recent volcanic activity in different parts of the world supports the inference that
volcanoes are located mainly in
A) the centers of landscape regions
B) the central regions of continents
C) zones of crustal activity
D) zones in the late stages of erosion
23. The presence of marine fossils at elevations high above sea level provides good evidence
for
A) continental glaciations
C) crustal uplift
B) crustal erosion
D) volcanic eruptions