PLATE TECTONICS

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CONTINENTAL DRIFT

EVIDENCE FOR SEA FLOOR SPREADING

PLATE TECTONICS

  1. lithospheric plates [Figure 3.7]
  2. Divergent plate boundaries
    1. spreading ridges under continents
    2. rift valleys
      • East African rift
    3. linear seas
    4. ocean basins
    5. midocean ridges
  3. Convergent plate boundaries
    1. oceanic-oceanic
      • subduction zone
      • deep-sea trench
      • volcanic island arc
    2. oceanic-continental
    3. continent-continent
  4. Shear boundaries
  5. Intraplate volcanic activity
    1. mantle plumes and hot spots volcanic island chains
  6. Plate Movement and Motion
  7. Driving Mechanism
    1. Mantle convection
    2. convection cells

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