Earthquake (Teach)

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

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Earthquake (Teach)

  1. 1. Rememberthe earth’scrust hashuge cracksor faults in it.As a result,the crust isbroken upinto hugepieces of rockcalled plates.
  2. 2. Although very slowly, these plates do movearound as they float on the top of the liquidrock in the mantle called magma.
  3. 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. 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. 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. 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. 7. Ground shaking as the result of anearthquakes can cause buildings, walls andbridges to collapse.
  8. 8. Cracks in the earth can open up as theresult of an earthquake.
  9. 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. 10. Tsunamis can occur.A tsunami is a largesea wave or series ofwaves that is causedby earthquakes andcan destroy townsalong the seashore.
  11. 11. In Texas, kids in school practice what to do if atornado were to strike.
  12. 12. In other parts of the world, kids haveearthquake drills.

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