Structure and Motion

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Structure and Motion

• Plate Tectonics

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Video

• NOAA Plate Tectonics
• (stop at boundary types)

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Plate Tectonics

• The Earths outer layer is made up of plates.
• Plate Tectonics is a theory of global dynamics
  having to do with the movement of semi-rigid
  sections of the Earths crust called plates.
• Seismic activity and volcanism occurs primarily
  at the margins of these plates.
• This movement has resulted in continental drift.

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Continental Drift

• A term applied to the possibility that the
  continents are in motion over the Earths
  surface.
• It was thought that the continents fit together
  like a jigsaw puzzle.
• Pangea was the supercontinent.
• Panthalassa was the large ocean that surrounded
  it.

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Do You Think They Fit Together?
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Continental Drift

• Plates are in constant motion, travelling a few
  centimetres per year.
• Include continental and oceanic crust.
• Convection currents within the mantle move the
  plates in different directions.

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The Continental Dance
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Video

• Science on a Sphere Plate Tectonics

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1. North American Plate
5. Pacific Plate
9. Indian Plate
2. Eurasian Plate
6. Nazca Plate
10. Australian Plate
3. Caribbean Plate
11. Antarctica Plate
7. South American Plate
4. Cocos Plate
8. African Plate