1. From the seismogram, the distance to the epicenter can be determined by measuring ______.
A. the difference in the arrival times of the P and S waves
B. the ratio of the amplitude of the largest P and S waves
C. the speed of the surface wave
D. the arrival time of the surface waves
2. When two tectonic plates collide, the oceanic crust usually subducts beneath the continental crust because it is *
A. denser than continental crust
B. thicker than continental crust
C. less dense than continental crust
D. thinner than continental crust
3. If you will visit a place in the Pacific known to be along converging plates, which of these should you not expect to see?
A. active volcanoes
B. rift valleys
C.mountain ranges
D. volcanic islands
4. You are an oceanographer and want to map the ocean floor on the east coast of the Philippines. As you do your study, you noticed that there is a portion of the ocean floor which is relatively much deeper than the rest. What most likely is that deeper part?
A. trench
B. linear sea
C. ocean ridge
D. volcanic islands
5. If you are a cartographer, what will give you an idea that the continents were once joined?
A. Ocean depth
B. Position of the south pole
C. Shape of the continents
D. Size of the Atlantic Ocean
6. As a new seafloor is formed at the mid-ocean ridge, the old seafloor farthest from the ridge is destroyed. Which of the stated processes describes how the oceanic crust plunges into the Earth and destroyed at the mantle?
A.Convection
B. Construction
C. Diversion
D. Subduction
7. Who were the two scientists who proposed the theory of seafloor spreading in the early 1960s?
A. Charles Darwin and James Hutton
B. Harry Hess and Robert Dietz
C. John Butler and Arthur Smite
D. F. Vine and D. Mathews
8. Which of the following can you infer from the continuous movement of the lithospheric plates over the asthenosphere?
A. All continents will cease to exist.
B. All the volcanoes in the Philippines will become inactive.
C. The continents will not be located in the same place as they are now.
D. The islands of the Philippines will become scattered all over the world.
9. 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 at the poles
C. convection current in the mantle
D. the force of the atmosphere
10. Where the old seafloor destroys when it gets farther from the ridge?
A. at the subduction zone
B. at the fault
C. at the Earth’s core
D. at the rift valley