1. IN: What force, do you suppose causes the plates to move?
Plate Tectonics 10/06/15
7-3 pgs
IN: What force, do you suppose causes the plates to move?

2. Sea-Flooring Spreading

3. Convection
Hot material deep within the Earth rises while cooler material near the surface sinks.
This is what causes tectonic plates to move around.

4. Convection

5. Ridge Push / Slab Pull

6. Ridge Push
The process by which an oceanic plate slides down the lithosphere- asthenosphere boundary.

7. Slab Pull
The process by which the edge of the oceanic plate sinks and pulls the rest of the tectonic plate with it.

8. Plate Tectonics
The theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the athenosphere.

9. Tectonic Plate Boundaries
There are 3 main types.
Convergent boundaries
Divergent boundaries
Transform boundaries

10. Convergent Boundaries
Collide
When two tectonic plates push into one another.

11. Convergent Boundaries
3 types:
Continental/Continental
Continental/Oceanic
Oceanic/Oceanic

12. Continental/Continental
Forms mountains

13. Continental/Continental
Forms mountains

14. Continental/Oceanic
Forms land volcanoes

15. Oceanic/Oceanic
Forms ocean volcanoes and islands

16. Subduction Zones
The region where oceanic plates sink down into the asthenosphere.

18. Divergent Boundaries Divide
When two tectonic plates move away from one another.

19. Divergent Boundary
Remember sea-floor spreading?

20. Transform Boundaries Slide
When two tectonic plates slide past each other horizontally.

21. Transform Boundary
Produce Earthquakes!
San Andreas Fault

22. Tracking Motion
GPS satellites

23. OUT: When convection takes place in the mantle, why does cooler material sink, while warmer material rises?