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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.

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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 motion1
Causes of Plate Motion

3 causes of plate motion

Convection Currents

Ridge Push

Slab Pull


Causes of plate motion2
Causes of Plate Motion

Convection

Hot magmaexpands and rises

Cool magmasinks

Changes in density


Causes of plate motion3
Causes of Plate Motion

Ridge Push

New magma pushes older rock at mid-ocean ridges


Causes of plate motion4
Causes of Plate Motion

Slab Pull

Gravity pulls down the subducting plate back into the mantle


Causes of plate motion5
Causes of Plate Motion

Mantle Plumes

  • An upwelling of hot magma from the core

  • Creates volcanic “hot spots”

  • Example:

    • Hawaii

    • Yellowstone N.P., Wyoming


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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