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PLATE BOUNDARIES

B40c. PLATE BOUNDARIES. Seafloor Spreading and Continental Drift Combined. CONTINENTAL DRIFT to PLATE TECTONICS. PLATE TECTONICS. PLATE = piece of the lithosphere (crust and upper mantle) TECTONICS = movement plates are moving on the asthenosphere (fluid, lower mantle).

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PLATE BOUNDARIES

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  1. B40c PLATE BOUNDARIES Seafloor Spreading and Continental Drift Combined

  2. CONTINENTAL DRIFTtoPLATE TECTONICS

  3. PLATE TECTONICS • PLATE = piece of the lithosphere (crust and upper mantle) • TECTONICS = movement • plates are moving on the asthenosphere (fluid, lower mantle)

  4. movement of asthenosphere due to temperature/density differences heating, rising, cooling, sinking asthenosphere drags lithosphere with it as it moves CONVECTION CURRENTS (B3, Figure 11)

  5. LOCATIONS OF PLATE BOUNDARIES (B3, Figure 12)

  6. plates moving away from each other asthenosphere rises below boundary, turns and pulls plates apart mid-Atlantic ridge earthquakes volcanoes DIVERGENT PLATE BOUNDARY (B5, Figure 14)

  7. plates moving towards each other asthenosphere sinks below boundary, pulls plate with it earthquakes Volcanoes (at some) 3 types CONVERGENT PLATE BOUNDARY (B5, Figure 15)

  8. two plates slide horizontally past each other San Andreas Fault earthquakes TRANSFORM PLATE BOUNDARY (B5, Figure 13)

  9. ASSIGNMENT • Draw each of the three types of plate boundaries. • Label the direction of plate movement for each. • For divergent and convergent, draw the convection current below the boundary.

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