Plate Tectonics 10.3 08 09
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Plate Tectonics 10.3 08 09

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    Plate Tectonics 10.3 08 09 Plate Tectonics 10.3 08 09 Presentation Transcript

    • Ch 10 Plate Tectonics
      • Section 10.3 Theory of Plate Tectonics
    • Ah – ha!
      • Scientists realized that the continental drift idea could be explained by sea floor spreading……(early 1960’s)
      • The Earth’s crust is broken into “plates” that move, grow, and subduct.
    • Page 280
      • Plates are made of ______ and upper ________; these compose the _________.
      • These ______ plates float and move atop the plasticlike layer called the ________.
      • Plates are made of crust and upper mantle ; these compose the lithosphere .
      • These rigid plates float and move atop the plasticlike layer called the asthenosphere .
    •  
    • The Earth’s Plates
    • Global Plate Motions
    •  
    • Types of Boundaries
      • Convergent
      • Divergent
      • Transform
    • Tectonics – study of formation of crustal features
      • Oceanic crust – thin, dense, basaltic
      • Continental crust – thick, less dense, granitic
    • Convergent Boundary
      • Ocean plate – continental plate
    • Convergent Boundary
      • ocean plate – ocean plate
    •  
    • Convergent Boundary
      • Continental plate – continental plate
    •  
    • Himalayan Mountains
    • Divergent Boundary Common at Mid-Ocean Ridges (M-O-R)
    •  
    •  
    • East African Rift Valley – Red Sea
    • Transform Boundary
    •  
    • What makes the plates move?
    • Plates move like they are groceries on a conveyor belt
    • What Drives It: Convection
    • Examples of convection
    • Examples of convection
    • Plate Tectonics
      • Features on Earth’s surface are a result of interactions of plates at their boundaries
        • Earthquakes
        • Faulted and folded mountains
        • Volcanic landforms
        • Rocks
    •  
      • No
      • Plates are destroyed as fast as they are created (2 ways)
      • Plates may be subducted and melted or may push be pushed upward to form mountains
      So is the Earth getting bigger?