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Plate Movement and Plate Boundaries

Plate Movement and Plate Boundaries

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Plate Movement and Plate Boundaries

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Presentation Transcript

  1. Plate Movement and Plate Boundaries Chapter 4, Section 3

  2. Plate Tectonics Theory • Lithosphere is divided into plates • Plates move around on the asthenosphere

  3. 3 Causes of plate motion

  4. Slab Pull • Oceanic plate sinks (more dense) • Pulls rest of tectonic plate with it

  5. Ridge Push • Oceanic crust is higher at ridge • Pushes plate underneath continent

  6. Convection • Happens in asthenosphere • Hot magma rises, cool magma sinks • Drags plates sideways

  7. 3 Types of Plate Boundaries • Convergent • Divergent • Transform Fault

  8. Convergent Boundaries

  9. Continent / Continent • Plates thicken and buckle • Push upwards • Mountain formation

  10. Continent / Oceanic • Oceanic plate sinks (more dense) • Subduction zone • Trenches form • Volcanic mtns on coast

  11. Oceanic / Oceanic • One slides under the other • Subduction zones • Volcanic Islands

  12. Divergent Boundary • Plates spread apart • Magma rises • New lithosphere formed • Mid – Atlantic Ridge

  13. Transform Boundary • Plates slide past each other • Produce earthquakes

  14. Types of Plate Boundaries: Divergent Convergent Transform

  15. Continent / Continent Examples • Appalachian Mtns. • Atlas Mtns.

  16. Continent / Oceanic Examples • Andes • Cascades • Mt. St. Helens

  17. Oceanic / Oceanic Examples • Aleutians • Japan • Philippines

  18. Plate Movement • Approx. 3-6 cm per year • Rate a fingernail grows!

  19. Flash card review