1. Continental Drift

3. Evidence: Fossils

4. Matching Mountain Ranges

5. Glacier Evidence

7. A new hope: Sea-Floor Spreading
MID-ATLANTIC RIDGE
50,000 km. Long mountain range on the ocean floor

8. Sea-Floor Spreading is a Divergent Plate Boundary
Creates New Crust

9. OCEAN CRUST - CONTINENTAL CRUST SUBDUCTION – TRENCH FORMS

10. Oceanic-Continental Convergent Boundary - SUBDUCTION
DENSER OCEANIC CRUST GOES DOWN INTO MANTLE

11. Oceanic-Continental Convergent Boundary - SUBDUCTION
DENSER OCEANIC CRUST GOES DOWN INTO MANTLE

12. OCEAN CRUST –OCEAN CRUST CONVERGENCE - SUBDUCTION

13. Continental Crust – Continental Crust Convergent Boundary
NO SUBDUCTION - COLLISION ZONE
WHY YOU FIND MARINE FOSSILS ON TOPS OF MOUNTAINS

14. Collision of India and Asia

15. TRANSFORM PLATE BOUNDARIES
Transform Fault Boundaries
TRANSFORM PLATE BOUNDARIES
At a transform fault boundary, plates grind past each other without creating or destroying the lithosphere.
SHALLOW EARTHQUAKES
 Transform faults
• Most join two segments of a mid-ocean ridge.
• At the time of formation, they roughly parallel the direction of plate movement.

16. Boundaries: Transform

17. SAN ANDREAS TRANSFORM FAULT

18. SUMMARY 3 PLATE BOUNDARIES
DIVERGING
CONVERGING (SUBDUCTION ZONE)
Oceanic Crust – Continental Crust
Oceanic Crust - Oceanic Crust
CONVERGING (COLLISION ZONE)
Continental Crust – Continental Crust
TRANSFORM

20. Convection Currents in the mantle drag and pull the lithospheric plates above them

22. More Evidence for Plate Tectonics
 Hot Spots
A hot spot is a concentration of heat in the mantle capable of producing magma, which rises to Earth’s surface; The Pacific plate moves over a hot spot, producing the Hawaiian Islands.
Hot spot evidence supports that the plates move over the Earth’s surface.

23. Hot Spot