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CAL LESSON

CAL LESSON. CLASS - V SUB - EVS LESSON - WHEN THE EARTH SHOOK ! BY Dr.C.RAJMOHAN,PRT KV,THIRUVARUR. EARTHQUAKES: WHY? AND HOW?. EARTHQUAKES. sudden movement or shaking of the Earth. Caused by plate tectonic stresses. Located at plate boundaries

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CAL LESSON

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  1. CAL LESSON • CLASS - V • SUB - EVS • LESSON - WHEN THE EARTH SHOOK ! BY Dr.C.RAJMOHAN,PRT KV,THIRUVARUR.

  2. EARTHQUAKES:WHY? AND HOW?

  3. EARTHQUAKES sudden movement or shaking of the Earth • Caused by plate tectonic stresses • Located at plate boundaries • Resulting in breakage of the Earth’s brittle crust

  4. PLATE TECTONIC STRESSES

  5. EARTHQUAKE DAMAGE • Landsides • Building damage • Liquefaction

  6. LIQUEFACTION when a solid (sand and soil) becomes saturated with water and acts like a heavy liquid • Results in a loss of soil strength & the ability of the soil to support weight

  7. EARTHQUAKE DAMAGE Most caused by SURFACE waves (arrive last)

  8. EARTHQUAKE WAVES Seismographs record earthquake waves

  9. EARTHQUAKE WAVES P waves move through solids & liquids S waves move through solids only!!!

  10. EARTHQUAKE WAVES Lets test your understanding!! Is this a P or an S wave? P wave! S Wave

  11. The effects of earthquakes also include other disasters such as, • TSUNAMI • FIRE • FLOOD

  12. TSUNAMI • The tsunami of the 2004 Indian Ocean earthquake

  13. FIRE Earthquakes can cause fires by damaging electrical power or gas lines

  14. FLOOD •  Earthquakes may cause landslips to dam rivers, which collapse and cause floods.

  15. Thank you

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