Plate tectonics
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Plate tectonics Presentation Transcript

  • 1.  
  • 2. Theory of Plate Tectonics Plate Tectonics Plate Boundaries Causes of Plate Tectonics
  • 3. Plate Tectonics
  • 4. What is Plate Tectonics
    • The Earth’s crust and upper mantle are broken into sections called plates
    • Plates move around on top of the mantle like rafts
  • 5.  
  • 6. What is the Lithosphere ?
    • The crust and part of the upper mantle = lithosphere
      • 100 km thick
      • Less dense than the material below it so it “floats”
  • 7. What is the Asthenoshere ?
    • The plastic layer below the lithosphere = asthenosphere
    • The plates of the lithosphere float on the asthenosphere
  • 8.  
  • 9. 2 Types of Plates
    • Ocean plates - plates below the oceans
    • Continental plates - plates below the continents
  • 10. Questions...
    • What is the theory of plate tectonics?
    • What is the lithosphere?
    • What is the asthenosphere?
    • What is the connection between the two?
    • What are the two types of plates?
  • 11. Plate Boundaries
  • 12. Divergent Boundaries
    • Boundary between two plates that are moving apart or rifting
    •  
    • RIFTING causes SEAFLOOR SPREADING
  • 13. Features of Divergent Boundaries
    • Mid-ocean ridges
    • rift valleys
    • fissure volcanoes
  • 14.  
  • 15.  
  • 16.  
  • 17. Convergent Boundaries
    • Boundaries between two plates that are colliding
    •  
    • There are 3 types…
  • 18. Type 1
    • Ocean plate colliding with a less dense continental plate
    • Subduction Zone : where the less dense plate slides under the more dense plate
    • VOLCANOES occur at subduction zones
  • 19.  
  • 20. Andes Mountains, South America
  • 21. Type 2
    • Ocean plate colliding with another ocean plate
    • The less dense plate slides under the more dense plate creating a subduction zone called a TRENCH
  • 22.  
  • 23. Aleutian Islands, Alaska
  • 24. Type 3
    • A continental plate colliding with another continental plate
    • Have Collision Zones:
      • a place where folded and thrust faulted mountains form.
  • 25.  
  • 26.  
  • 27. Transform Fault Boundaries
    • Boundary between two plates that are sliding past each other
    • EARTHQUAKES along faults
  • 28.  
  • 29. San Andreas Fault, CA
  • 30. Questions...
    • What are the three types of boundaries?
    • What direction do plates go for each?
    • Which boundary has a subduction zone…what occurs at a subduction zone?
  • 31. Causes of Plate Tectonics
  • 32. Convection Currents
    • Hot magma in the Earth moves toward the surface, cools, then sinks again.
    • Creates convection currents beneath the plates that cause the plates to move .
  • 33.  
  • 34. Questions...
    • What causes plates to move?
    • How is a convection current formed?