1. Plate Tectonics

2. The crust is broken into plates that float on the mantle. The crust is broken into plates that float on the mantle. Sometimes the plates move toward and under each other and sometimes they move away from each other. Sometimes the plates move toward and under each other and sometimes they move away from each other. Plate Tectonics is the theory that describes the formation, movements and interactions of these plates. Plate Tectonics is the theory that describes the formation, movements and interactions of these plates.

3. The world in pieces

4. Movement of plates The movement of plates causes The movement of plates causes Earth quakes Volcanoes Mountains Trenches Mid-ocean ridges Rift Valleys

5. 3 Types of Plate Boundaries Convergent (moving together) Convergent (moving together) Divergent (moving apart) Divergent (moving apart) Transform (moving side to side) Transform (moving side to side)

6. Convergent Boundaries Plates are moving towards each other Plates collide and the denser plate (oceanic) goes under the other (continental) called SUBDUCTION Volcanoes, mountains, and earthquakes occur at Convergent Boundaries  Crust is destroyed

7. 3 types of convergent boundaries Continental-Oceanic Continental-Oceanic ex. Andes Continental-Continental Continental-Continental ex. Himalayas Oceanic-Oceanic Oceanic-Oceanic Ex. mid-ocean trenches like Marianas Trench and Island Volcanoes like the Philippines and Japan

8. Divergent Boundary Where new crust is created as the plates move away from each other. Where new crust is created as the plates move away from each other. The best known of the divergent boundaries is the Mid-Atlantic Ridge The best known of the divergent boundaries is the Mid-Atlantic Ridge Forms Rift Valleys on land and Ocean Ridges under water Forms Rift Valleys on land and Ocean Ridges under water

9. Plates spread apart Plates spread apart Creates new crust (called GROWTH MATERIAL) Creates new crust (called GROWTH MATERIAL)

10. Transform boundaries Two plates move past each other, side to side They cause earthquakes and create faults Ex. The San Andreas fault zone, which is about 800miles long