| A | B |
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| When the force of mountains is great enough they break,producing vibrations called____________ | earthquakes |
| Once the clastic limit of rocks is passed they break and move along surfaces called_____ | faults |
| An earthquake with a magnitude of 8.8 releases _______ times more energy that an earthquake with a magnitude of 7.8 | 32 |
| _________ structures are safer during an earthquake because then tend not to crumble | seismic-safe |
| Most lives that are lost during an earthquake are die to _________ | collapse of buildings |
| A person located twice as far from an epicenter as another person will notice that the time between the arrival of the primary and secondary waves will be_______ | larger |
| _____is the force that squeezes and compresses | compression |
| _________is the stress that causes stretching and elongation | tension |
| ____is the force that causes slippage | shearing |
| ____faults are caused by tensional forces | normal |
| ______faults are caused by compressional forces | reverse |
| ____faults are caused by shear forces | strike-slip |
| Along a_____ fault rock above the fault surface moves downward in relation to the rock tht is below the fault surface | normal |
| along a _________ fault, rock above the fault surface is forced upward and over the rocks that are below the fault surface | reverse |
| which state in the United States has the most amount of earthquakes | California |
| the earthquake in Kansu, China registered an 8.5 on the Richter Scale, which was 10 times greater than the earthquake in Messina Italy. What did the earthquake in Messina Italy register on the Richter Scale? | 7.5 |
| In order to locate an epicenter of an earthquake, a sieismologist must draw at least _____ circles | 3 |
| The downward fold in a mountain is called a_______ | syncline |
| The appalachian Mountains in the eastern United States are what type of mountain | folded |
| To locate an earthquakes_______ seismologists use information from 3 seismograph stations | epicenter |
| These move through the earth causing particles in the rocks to move at right angles to the direction of the waves | secondary waves |
| By noting the change in speed and path of ______ scientists have been able to determine the structure of the earth's interior | seismic waves |
| Seismologists use the _____ to describe the magnitude of earthquakes | Richter Scale |
| Most of the destruction during an earthquake is caused by_____- | surface waves |
| an earthquake with a ____ of 7.5 releases 32 times as much energy as an earthquake that registers a 6.5 on the Richter Scale | magnitude |
| When rocks break because of stress, the energy released is in the form of a _________ | earthquake |
| When the build-up of stress in the earth's crust is so great that rocks reach their _____earthquakes occur | elastic-limit |
| A reverse fault is often located along a ____plate boundary | convergent |
| The San Andreas fault in California is an example of a________ | strike-slip/transform |
| the bending,tilting,and breaking of the earth's crust. | deformation |
| the sudden return of elastically deformed rock to its undeformed shape | elastic rebound |
| an instrument that records vibrations in the ground and determines the location and strength of an earthquake | seismograph |
| a tracing of earthquakes motion that is creates by a seismograph | seismogram |
| the point a;ong a fault at which the first motion of an earthquake occurs | focus |
| a hypothesis that is based on the idea that a major earthquake is more likely to occur along the part of an active fault where no earthquakes have occurred for a certain period of time | gap hypothesis |
| an area along a fault where relatively few earthquakes have occurred recently but where strong earthquakes have occurred in the past | seismic gap |
