Earthquakes

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Earthquakes

• 6th Grade Science
• Ms. Jennifer Ransom
• January 30, 2004

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Lets Learn About Earthquakes!
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Earthquakes

• Definition
• Causes
• Interesting Facts
• Devastating Examples from History

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What is an earthquake?

• Shaking of the ground
• Breaking and shifting of earths outer shell
• Some of earths most powerful events
• Usually causes other natural disasters
• McNally, Karen C.. "Earthquake." World Book
  Online Reference Center. Jan. 2004. World Book,
  Inc. 27 Jan. 2004. http//www.aolsvc.worldbook.aol
  .com/ar?/na/ar/co/ar171680.htm.

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• Earthquakes often cause other natural disasters.
• Fires sometimes occur.
• 1906 earthquake caused fire damage.
• Look at the blackened building.

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Causes of Earthquakes

• Plates shift in earths outer crust.
• Stress occurs on rocks along faults.
• Excessive stress causes rocks to break.
• Rocks move into new positions.
• This causes the shaking of earthquakes.

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Interesting Facts

• Earthquakes rarely kill people
• Building collapses do!

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Interesting Facts

• Even buildings left standing are dangerous.
• There is often structural damage.

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Effects of Earthquakes

• People are often left homeless.
• They must find temporary housing.

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Effects of Earthquakes

• Food and water may be scarce.
• People wait in line for water.
• Bread lines are also long!
• 1806 earthquake victims struggled to survive.

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Effects of Earthquakes

• Looting often takes place.
• Chaos usually makes things worse.
• Police patrols are necessary.

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Effects of Earthquakes

• Sometimes government must get involved!
• Check out this proclamation in 1906.
• This San Francisco earthquake was devastating!

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Devastating Examples from History

• Charlestons famous earthquake
• Early morning earthquake on February 7, 1812
• It began at about 330 a.m.
• Shaking continued for about 25 minutes.
• Shaking caused severe structural damage.
• Information courtesy of the following collection
  in the American Memory Collection of the Library
  of Congress
  
• An American Time Capsule Three Centuries of
  Broadsides and Other Printed Ephemera.

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Devastating Examples from History

• San Franciscos famous earthquake of 1906
• Quake caused damage to some buildings.
• Other buildings were undamaged.
• Look at some scenes from 1906.

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Devastating Examples from History

• Finally, look at other dangerous results.
• First picture exposed water pipes
• Second picture twisted streetcar tracks

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Earthquakes

• Respond to what you have learned.
• Write a one-half page response.
• Discuss at least five things about earthquakes.
• Include any or all of these
• Causes
• Effects on people or land
• Examples

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Acknowledgements

• Pictures and most information provided courtesy
  of the American Memory Collection of the Library
  of Congress.
  
• Earthquake definition and causes provided (as
  noted) by World Book Online.