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Pearson 6th Earth Science terms and defintions

Pearson 6th Earth Science terms and defintions



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Earthquakes Earthquakes Presentation Transcript

  • 1. ______-places in the Earth’s crust where rocks have broken apart faults
  • A. ______ _____- areas where tension forces cause rock above the fault surface to move downward normal faults View slide
  • 1)____________- a block of rock that forms the upper half of the fault 2)____________- a block of rock that forms the lower half of the fault hanging wall footwall View slide
  • B. _______ _____- areas where compression forces cause rock above the fault to move _________ reverse fault upward
  • C. ________________- areas where shearing forces cause plates to move sideways past each other (horizontally) strike-slip fault
  • Reverse
  • 2. _____________- energy waves produced by an earthquake; earthquakes are the vibrations felt when this movement happens. seismic waves
    • ______________- travel through Earth by causing particles in rocks to compress and stretch apart in the direction of the wave;
    • fastest
    • B. _______________- travel through Earth causing particles in rocks to move at right angles to the direction of the waves
    primary waves secondary waves
  • C. _____________- energy that travels out from the epicenter surface waves
    • D. Seismic waves ____ and ______ speed as the density of rock changes
    • P-waves _____ when they contact the outer core.
    • S-waves are _______ completely by the outer core.
    3)___________-area where no S-waves are received bend change bend stopped shadow zone
  • 3. ______- point in the Earth’s interior where the energy is released during an earthquake focus
  • 4. _________- point on the Earth’s surface directly above the focus epicenter
  • 5. ___________- an instrument that measures earthquake activity seismometer
  • 6. __________- measure of the energy released by an earthquake activity magnitude
  • 7. _____________- describes how much energy is released during an earthquake; for each 1.0, the amplitude of the largest surface wave is 10 times greater; 32 times as much energy is released for each 1.0 increase Richter Scale
  • 8.__________- assesses _______; rates from I to XII; based on intensity (amount of damage) Mercalli damage
  • Damaging Earthquake in the US (1750 - 1996)                                                                                                              
  • 9. ____________- occurs when wet or soft soil becomes more like a liquid from shaking (like a milkshake) liquefaction
  • 10. ________- huge ocean waves caused by seismic activity tsunami
  • Tsunami- Dec. 26, 2004 Other sites
  • The End