1. Plate Tectonics- Part 3 The plates and the Theory that made them FAMOUS!

2. How Continents Move Earth’s crust and rigid upper pat of the mantle form a layer of earth called the lithosphere. The lithosphere is broken into 12 major pieces and several smaller ones The earth’s crust is either oceanic, dense and rich in iron; it can be continental, low density and rich in silica

4. The tectonic plates ride upon molten rock material, this is the asthenosphere.

5. Types of Tectonic Plates Divergent boundaries are plates that move away from each other. ( middle of the Atlantic Ocean)

6. Convergent plates are plates that are moving toward each other. They may subduct or collide. (Along the coast of South America)

7. Colliding plate boundaries- and example of convergence ( India and Asia)

8. Transform boundaries occur when two plates are sliding beside each other. ( San Andreas Fault, CA)

9. Causes of Plate Motion The movement of the plates is caused by movement in the asthenosphere. Molten magma rises from the core and moves upward toward the lithosphere. This is a convection current

11. Convection currents produce two types of movement to occur, sinking and separating. When the currents rise, it causes the plates to diverge, or separate When the currents sink, it causes the plates to converge, or sink Why do they currents rise and sink????

13. As the cooling material sink, the asthenosphere below it exerts force on the rest of the plate. This is known as ridge push.

14. When the leading edge of a plate sinks, it pulls the rest of the plate along behind it. This is known as slab pull.