SUMMATIVE TEST #1

A plate boundary is a fracture that separates one plate from another. Neighbouring plates can move relative to one another in different ways such as moving towards each other. Why does oceanic crust subduct beneath the continental crust when the tectonics plate collide?

• A. Because it is denser than continental crust

• B. Because it is thicker than continental crust

• C. Because it is less dense than continental crust

• D. Because it is thinner than continental crust

Given the diagram of the layers of the earth on the right. How do you compare the densities of 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 crust.

• 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 crust.

Refer to the diagram of lithosphere on the right side. Which of statements does not describe lithospheric plates.

• A. have the same thickness everywhere

• B. include the crust and upper mantle

• C. thickest in the mountain regions

• D. vary in thickness

Which of the following can you infer from the continuous movement of the lithospheric plates over the asthenosphere?

• A. All the 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 continents will be covered and submerged in ocean.

A seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station as a function of time. Look at the seismogram on the right. Which of the following seismic waves is the first to be recorded?

• A. P-waves

• B. S-waves

• C. Surface Waves

• D. Love Waves

You were provided with data showing the arrival time of the P and S-waves recorded from three seismic stations. Which of these can you possibly determine?

• A. the damage at the focus

• B. the magnitude of an earthquake

• C. the intensity of the earthquake

• D. the location of the earthquake epicenter

A seismic wave is an elastic wave generated by an impulse such as an earthquake or an explosion. Arrange the following arrival time of seismic waves as recorded on the seismogram.

• A. P-wave ----> S-Wave ----> Body Waves

• B. S-wave ----> P-Wave ----> Surface Waves

• C. Surface waves ----> P-Wave ----> S-Wave

• D. P-wave ----> S-Wave -----> Surface Waves

. An earthquake is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. We cannot predict the occurrence of an earthquake but we can determine the epicenter. A technique of determining the epicenter of an earthquake using the arrival time of P-S Wave is called ______________.

• A. Ray diagram

• B. Triangulation method

• C. Seismology

• D. Seismograph

You were asked to locate the epicenter of a recent earthquake. Which of the correct sequence of events should you follow?

I. Determine the difference in the arrival time of S and P waves recorded from each of the seismological stations.

II. Use the triangulation method to locate the center.

III. Obtain data from three different seismological stations.

IV. Determine the distance of the epicenter from the station

• A I,III,II,IV

• B. III,I,IV,II

• C. III,IV,I,II

• D.IV,II,I,III

The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. In this hypothetical earthquake we applied the triangulation method. Which among the city in California where they able to locate the epicenter of this hypothetical earthquake?

• A. Los Angeles

• B. Salt Lake City

• C. San Francisco

• D. Portland