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Intro

Objective 10/06/11. Describe the three forces thought to move tectonic plates. Intro. What do you think causes tectonic plates to move?. Causes of Plate motion. Causes of Plate Motion. 3 causes of plate motion. Convection Currents Ridge Push Slab Pull. Causes of Plate Motion.

kylee-copeland
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Intro

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Presentation Transcript

  1. Objective 10/06/11 Describe the three forces thought to move tectonic plates. Intro What do you think causes tectonic plates to move?

  2. Causes of Plate motion

  3. Causes of Plate Motion 3 causes of plate motion Convection Currents Ridge Push Slab Pull

  4. Causes of Plate Motion Convection Hot magmaexpands and rises Cool magmasinks Changes in density

  5. Causes of Plate Motion Ridge Push New magma pushes older rock at mid-ocean ridges

  6. Causes of Plate Motion Slab Pull Gravity pulls down the subducting plate back into the mantle

  7. Causes of Plate Motion Mantle Plumes • An upwelling of hot magma from the core • Creates volcanic “hot spots” • Example: • Hawaii • Yellowstone N.P., Wyoming

  8. Objective 10/06/11 Describe the three forces thought to move tectonic plates. Outro List two ways convection currents effect your life.

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