Plate Tectonics BOUNDARIES

1. Plate TectonicsBOUNDARIES Chapter 17 Learning Targets: What are the three types of plate boundaries? What features can be found at each one?

2. Plate Tectonics • Earth’s crust is cracked into smaller pieces called PLATES • Looks like a cracked egg shell • There are two types of crust • Continental crust • Oceanic crust

4. Plate Boundaries • Divergent Boundary • Moving away • Convergent Boundary • Moving together • Transform Boundary • Sliding past each other

5. Plate Tectonics • Divergent Plate Boundaries • Magma comes up pushing plates away • New rocks are created • Mid-Ocean Ridge = largest divergent boundary • Underwater Mountain Range • Called a Rift Valley if on land • Great Rift Valley in Africa

6. Watch Animation

7. Plate Tectonics • Divergent Boundary • Plates are moving AWAY from each other • I need 2 Volunteers! • DIVergent DIVorce

8. Plate Tectonics • Convergent Boundaries • There are 2 main types of Convergent Boundaries • First one is when an oceanic plate meets a continental plate

9. Oceanic – Continental Boundary • Oceanic Crust is denser than Continental Crust • Oceanic Crust gets SUBDUCTED underneath Continental Crust • Subduction goes underneath • Creates a Trench and Volcanoes • Example: Mt. St. Helens Watch Animation!

10. Continental – Continental Boundary • Plates have same densities • No subduction • Plates Collide and land goes UP • Mountains are created • Paper Demo • Example: Himalayan Mountains (Mt. Everest)

12. Plate Boundaries • Convergent Boundaries • Plates moving TOWARDS each other • Need 2 more Volunteers! • Convergent  Connecting or COUPLE

13. Plate Boundaries • Transform Boundary • A.k.a Sliding boundary • One plate is sliding horizontally past another plate • Earthquakes are common at these boundaries • The San Andreas Fault (California) is the most well known example

14. Watch Animation