1. Plate Movement and Plate Boundaries Chapter 4, Section 3

2. Plate Tectonics Theory Lithosphere is divided into plates Plates move around on the asthenosphere

4. 3 Causes of plate motion

5. Slab Pull Oceanic plate sinks (more dense) Pulls rest of tectonic plate with it

6. Ridge Push Oceanic crust is higher at ridge Pushes plate underneath continent

7. Convection Happens in asthenosphere Hot magma rises, cool magma sinks Drags plates sideways

8. 3 Types of Plate Boundaries Convergent Divergent Transform Fault

9. Convergent Boundaries

10. Continent / Continent Plates thicken and buckle Push upwards Mountain formation

11. Continent / Oceanic Oceanic plate sinks (more dense) Subduction zone Trenches form Volcanic mtns on coast

12. Oceanic / Oceanic One slides under the other Subduction zones Volcanic Islands

13. Divergent Boundary Plates spread apart Magma rises New lithosphere formed Mid – Atlantic Ridge

14. Transform Boundary Plates slide past each other Produce earthquakes

15. Types of Plate Boundaries: DivergentConvergentTransform

18. Continent / Continent Examples Appalachian Mtns. Atlas Mtns.

19. Continent / Oceanic Examples Andes Cascades Mt. St. Helens

20. Oceanic / Oceanic Examples Aleutians Japan Philippines

21. Plate Movement Approx. 3-6 cm per year Rate a fingernail grows!