16. How do you compare the densities of the Earth’s crust, mantle, and core?
a. The mantle is less dense than the core but denser than the crust.
b. The mantle is less dense than both the core and the mantle.
c. The mantle is denser than the core but less dense than the crust.
d. The mantle is denser than both the core and the mantle.
17. If all the inner layers of the Earth are firm solid, what could have happened to Pangaea?
a. It remained as a supercontinent. b. It would become as it is today.
c. It would have slowly disappeared in the ocean. d. It would have stretched and covered the
whole word.
18. The lithospheric plates are believed to be moving slowly. What is the driving force that facilitates this
movement?
a. gravitational force of the moon b. magnetic force of the poles
c. convection current in the mantle d. the force of the atmosphere
19. Data for the arrival time of the P and S-waves were collected from three seismic stations. What can
be possibly determined?
a. the distance of the earthquake b. the location of the epicenter
c. the intensity of the earthquake d. the damage of the earthquake
20. Right in the middle of an island, you can find a rift valley. What type of plate boundary exists on that island?
a. convergent b. divergent c. normal fault d. transform fault
21. What would you NOT expect to find at a mid-ocean ridge?
a. mountain b. trenches c. volcanoes d. rift valleys
22. Converging oceanic plates will cause the formation of trenches, and these trenches will become the sources of
earthquakes. What event may happen due to strong underwater earthquakes?
a. Tsunamis
b. Volcanic eruption
c. Storm surges
d. High tides
23. The layer of the Earth that accounts for the Earth’s magnetic field.
a. crust b. mantle c. inner core d. outer core
24. This is the soft, weak upper portion of the mantle where the lithospheric plates float and move around.
a. crust b. mantle c. asthenosphere d. biosphere
25. This theory states that all the continents of the Earth were once one large landmass that broke apart and
where the pieces moved slowly into their current locations.
a. The Continental Drift Theory b. The Plate Tectonic Theory
c. The Seafloor Spreading Theory d. The magnetic Reversal Theory
26. Data from a hypothetical earthquake showed the difference in the arrival time of P-wave and S-wave on a seismic
station is 12.28 seconds. What is the approximate distance of the epicenter from this station?
a. 535. 1 km b. 515.3 km
c. 153.5 km
d. 315.5 km
For questions number 27-29, choose from the following answers.
a. Earthquakes b. Mountains, volcanoes, trenches, earthquakes
c. Rift valleys, oceanic ridges, earthquakes d. Mountains, volcanoes, rift valleys, earthquakes
27. What geologic event or features would result between plates moving away from each other?
28. What geologic event or features would result between plates moving toward each other?
29. What geologic event or features would result between plates sliding past each other?
30. Crustal plate A and Crustal plate B are moving away from each other. What is the average rate of?
motion between Plates A and B?
a. a few centimeters per century b. a few centimeters per day
c. a few centimeters per month d. a few centimeters per year
31. Plates A and B shows a divergent boundary. If Plate C is adjacent to both plates and does not show
any relative motion, what type of plate boundary is present between Plates A and C? See the figure.
a. convergent b. divergent c. normal fault d. transform fault
32. What geologic event is most likely to happen at the given type of plate boundary in number 31?
a. volcanic eruption b. mountain formation c. earthquake d. rift valley formation
33. If the Atlantic Ocean is widening at a rate of 2.5 cm per year, how far in kilometers will it spread in a
million years?
a. 2500 kilometers b. 250 kilometers c. 25 kilometers d. 2.5 kilometers
34. A continent is drifting at the rate of 3 cm/yr. How long will it take for it to cover a distance of 450 km?
a. 15,000 yr b. 150,000 yr c. 150,000,000 yr d. 15,000,000 yr.
35. The current produced in the mantle and serves as the driving force for the plates to move around.
a. Convention current b. Convection current
c. Core current d. Mantle current
