1. PLATE BOUNDARIES Seafloor Spreading and Continental Drift Combined B40c

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

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

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

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

8. TRANSFORM PLATE BOUNDARY two plates slide horizontally past each other San Andreas Fault earthquakes (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.