1. The P and S waves from the same earthquake arrive at a single seismograph station at different times. The difference between these times can be used to determine which one of the following? (Points : 1)
the intensity of the earthquake
the focus of the earthquake
the distance to the earthquake
the length of the earthquake
2. When rocks are under stress, they first deform, and then break to relieve the stress. This is known as the _______________ theory. (Points : 1)
3. During an earthquake you should _____, duck, cover, and hold. (Points : 1)
4. S waves cannot travel through the outer core because it is ________________. (Points : 1)
made of metal
5. Scientists measure two earthquakes during the same week—one in Missouri with a magnitude of 2.4, and one in California with a magnitude of 4.8. Based only on this information, what can you conclude about the two earthquakes? (Points : 1)
The focus of the Missouri quake was closer to the surface.
The Missouri quake released less energy.
Less damage was caused by the Missouri quake.
The Missouri quake lasted a shorter amount of time.
6. Which of the following describes the geological cause of an earthquake? (Points : 1)
Magma shifts suddenly underground, melting new rock.
Rocks of greater density suddenly shift beneath rocks of lesser density.
Large waves impact coastal regions and transfer their energy to land.
Rocks deformed by stalled tectonic motion suddenly fracture.
7. An earthquake with the epicenter on the ocean floor may cause a giant wave called a _____________. (Points : 1)
8. A company is looking to construct an office building in a region that experiences a high amount of earthquakes. All of the following are wise safety precautions except for which one? (Points : 1)
lay the foundation in firm ground rather than loose soil
build in an area identified as a “seismic gap”
build using fireproof materials, flexible materials, and foundational rollers
restrict the height of the building
9. A(n) _____ is a particular zone where rocks have been stressed and deformed but no earthquake has happened for many years. (Points : 1)
10. The magnitude of an earthquake is described using the _______________. (Points : 1)
S and P Wave index
11. Researchers discover a chain of volcanic islands in the Pacific Ocean that are frequently disturbed by earthquakes. What is the best explanation for this? (Points : 1)
Tsunamis are common in the Pacific Ocean.
Volcanic eruptions may cause earthquakes.
The islands are above tectonic plate boundaries.
The islands receive aftershocks from continental faults.
12. Additional tremors that occur shortly after the main earthquake are known as _______________. (Points : 1)
P and S Waves
13. Which of the following does not affect the intensity of an earthquake? (Points : 1)
14. A large earthquake in which of the following regions would most likely produce a tsunami? (Points : 1)
Yellowstone National Park
Ring of Fire
Mississippi River Basin
15. What is the only 100% certain way of predicting an earthquake? (Points : 1)
studying unusual weather patterns
measuring drastic temperature changes in rock
observing strange animal behavior
There is no 100% reliable way of predicting an earthquake.
16. A single earthquake can have more than one _______________. (Points : 1)