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Science · Earth sciences
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1. An earthquake is a release of energy in the form of

a) Sonic waves

b) Seismic waves

c) Thermal waves

d) Electromagnetic waves

2. The epicenter of an earthquake is

a) The point on the surface nearest to the focus

b) The point beneath the surface where the quake originates

c) The point on the closest fault where stress has accumulated

d) The point where the most accurate seismic measurement has been made

3. Faults are best described as

a) Plate boundaries

b) Cracks in the crust along which movement takes place

c) Cracks in the crust along which no movement takes place

d) The result of excessive tensional stress in any body of rock

4. The San Andreas fault is a

a) Normal fault

b) Thrust fault

c) Strike-slip fault

d) Reverse fault

5. Earthquakes are associated with plate boundaries because

a) Volcanism is common at plate boundaries

b) Rocks of different strength collide at plate boundaries

c) Plate boundaries are areas in which stress accumulates

d) Mountain ranges grow at plate boundaries

6) The velocities of P-waves and S-waves are best compared by which statement?

a) P-waves travel more slowly

b) P-waves travel more quickly

c) Both waves travel at the same speed but P waves can move through liquids

d) Both waves travel at the same speed but S waves can move through liquids

7) The minimum number of seismographs needed to determine the epicenter of an earthquake is

a) one

b) two

c) three

d) four

8) Structures in earthquake prone areas should be built on rock rather than sandy soil because:

a) Rock is not affected by seismic waves

b) Rock is affected by seismic waves but can’t be broken by them

c) Sandy soil amplifies the effect of seismic waves

d) Sandy soil is more likely to be removed by tidal waves than rock

9) The southernmost section of the San Andreas fault is considered at highest risk of a large magnitude quake, compared to other segments, because

a) It is the site of deep cracks in the surface

b) It is the segment where strong earthquakes have occurred in the last 300 years

c) It is a sement for which geologists are missing historical data about earthquakes

d) It is a segment where a great deal of stress may be accumulating

10) Earthquakes can be accurately forecasted and predicted, true or false?

a) True

b) False

11) Planetary differentiation has created a layered structure of the Earth’s interior, best explained by:

a) Nuclear reactions in the core

b) The accretion of successive layers of different materials in the early stages of Earth’s history

c) The increasing pressure within the Earth as distance from the surface increases

d) The response to gravity of materials with different densities

12) Scientists know that the Earth has a layered structure because

a) Each layer emits characteristic electromagnetic waves

b) P waves cannot penetrate the liquid core of the Earth

c) Seismic waves exhibit different behavior when passing from one layer to another

d) Scientists have obtained samples of each layer

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