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science chp 6 8th gr

Science Chapter 6 8th grade

QuestionAnswer
Earthquakes vibrations produced when rocks break along a fault
Fault surface along which rocks move when they pass their elastic limit and break
normal fault break in rock caused by tension forces, where rock above the fault surface moves down relative to the rock below the fault surface
Reverse fault break in rock caused by compression forces, where rock above the rock surface moves upward relative to the rock below the fault surface
Strike-slip fault break in rock caused by shear forces, where rocks move past each other without much vertical movement
Epicenter point on Earth's surface directly above an earthquakes focus
Focus in a earthquake, the point below Earth's surface where energy is released in the form of seismic waves
Primary Wave seismic wave the\at moves rock particles back-and-forth in the same direction that the wave travels
Secondary Wave seismic wave that moves rock particles at right angles to the direction of the wave
Seismic Wave wave generated by an earthqauke
Seismograph instrument used to register earthqauke waves and record the time that each arrived
Surface Wave seismic wave that moves rock particles up-and-down in a backward rolling motion and side-to-side in a swaying motion
Liquefaction occur when wet soil acts more like a liquid during an earthquake
Magnitude measure of the enrgy released during an earthquake
Tsunami seismic sea wave that beging over an earthquake focus and can be highly destructive when it crashes on shore
tension normal fault, divergent boundary
shear strike-slip fault, transform boundary
compression reverse fault, convergent boundary
normal fault the force of tension pulls the rocks apart
reverse fault the force of compression push the rocks together
strike-slip fault the force of shear push the rocks past each other
Richter scale measures magnitude; based on height of lines on seismogram; measurement reads "earthquake with a magnitude of 8.5"
Mercalli scale Describes the intesity using the amount of damage in a certain area; measurement reads "earthqauke with intensity of 12"
Created by: kmm0602
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