Earthquake (Teach)
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Earthquake (Teach)

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Short description of earthquakes, some reasons they occur and a look at the damage they can cause.

Short description of earthquakes, some reasons they occur and a look at the damage they can cause.

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Earthquake (Teach) Presentation Transcript

  • 1. Rememberthe earth’scrust hashuge cracksor faults in it.As a result,the crust isbroken upinto hugepieces of rockcalled plates.
  • 2. Although very slowly, these plates do movearound as they float on the top of the liquidrock in the mantle called magma.
  • 3. Sometimes when these plates move in oppositedirections they rub against one another . The rough edges where the plates come together get caught and prevent the huge slabs of rock from going anywhere.But when enough pressure builds up, theplates break loose with a jolt—an earthquake.
  • 4. It would be Oncelike a force enoughpulling one pressurehalf of a buildscracked up, whatpencil one wouldway and happen?another forcepulling theother half ofthe pencil the Yes,thepencilopposite way. would break.
  • 5. http://earthquake.usgs.gov/learn/animations/animation.php?flash_title=Elastic+Rebound+Flash+Animation&flash_width=300&flash_height=350&flash_file=elasticrebound
  • 6. But what happens to people and thingson the Earth’s surface when anearthquake occurs?The huge jolt causes everything to moveand shake violently.
  • 7. Ground shaking as the result of anearthquakes can cause buildings, walls andbridges to collapse.
  • 8. Cracks in the earth can open up as theresult of an earthquake.
  • 9. Rock slides and/or landslides on mountains andhillsides. During an earthquake, large rocks andportions of earth high up in the hills can becomedislodged and rapidly roll or slide down into thevalleys.
  • 10. Tsunamis can occur.A tsunami is a largesea wave or series ofwaves that is causedby earthquakes andcan destroy townsalong the seashore.
  • 11. In Texas, kids in school practice what to do if atornado were to strike.
  • 12. In other parts of the world, kids haveearthquake drills.