1. Tectonic Plate Motion 10/5/15 7-3a pg. 177 IN: What do you think is causing sea-floor spreading and tectonic plates to move? Put your DRW on the books

2. Sea-floor Spreading  The process by which new oceanic lithosphere is created as older materials are pulled away.

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

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

6. Ridge Push / Slab Pull

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

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

9. Ridge Push / Slab Pull

10. Convection

11. Sea-Flooring Spreading

12. Flash Presentation

13. These plates are moving around.  Which means that they: ◦ Collide  run into one another ◦ Divide  move away from one another ◦ Slide  slide past one another

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