Earthquake

1.Giant sea waves caused by an earthquake on the ocean floor are called

• a. plates

• b. faults

• c. tides

• d. tsunamis

2. The shaking and trembling that result from the sudden movement of a part of the earth’s crust is known as ___________.

• a. landslide

• b. mudflow

• c. earthquake

• d. tectonic plate

Study the figure below. Use it as your basis for your answers to items 3 and 4.

3. The underground point of origin of an earthquake islocated at x. What does x represent?

• a. focus

• b. epicenter

• c. magma

• d. wave

4. The spot on the surface of the earth directly above x is y. What do you call y?

• a. focus

• b. epicenter

• c. magma

• d. wave

5. The phenomenon that results when the shaking brought on by an earthquake decreases the stiffness and strength of soil is called

_______.

• a. siltation

• b. liquefaction

• c. landslide

• d. fire

6. The zone that circles the Pacific Ocean is called the Ring of Fire because there are many _________ in this area.

• a. forest fires starting

• b. denuded mountains

• c. volcanoes erupting

• d. deep valleys

7. The ___________ Scale contains the values of the magnitude of an earthquake.

• a. Celsius

• b. Richter

• c. Mercalli

• d. Rossi-Forel

8. The destructive effects of an earthquake are indicated by its intensity.

• a. True

• b. False

9. When an earthquake has a magnitude of 8 on the Richter Scale, how will you describe its effects on areas near the epicenter?

• a. damaging shocks

• b. destruction in populated areas

• c. serious damage to buildings

• d. destroyed communities

10. What is the safety measure that people should observe before an earthquake occurs?

• a. Conduct fire drills.

• b. Conduct earthquake drills.

• c. Conduct military drills.

• d. Conduct calisthenics drills.