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Plate tectonics
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  • 1. http://www.youtube.com/ watch?v=Kpoko_l34ZE&fea ture=related http://www.youtube.com/ watch?v=ryrXAGY1dmE&fe ature=related
  • 2.  The lithosphere is broken into separate sections called plates. They “float” on the asthenosphere  Sea-floor spreading and continental drift into a single theory – The Theory of Plate Tectonics  Plate Tectonics – is the geological theory that states that pieces of Earth’s lithosphere are in constant, slow motion, driven by convection currents in the mantle.  The theory of plate tectonics explains the formation, movement, and subduction of Earth’s plates
  • 3. 1. Transform Boundaries –  Crust is neither created nor destroyed  Place where two plates slip past each other, moving in opposite directions
  • 4. 2. Divergent Boundaries  Place where two plates move apart  When develops on land, two of Earth’s plates pull apart. A deep valley called a rift valley forms along the divergent boundary
  • 5. 3. Convergent Boundaries  Place where two plates come together  Converging oceanic plate and oceanic plate collide one plate is subducted through a trench and volcano islands are formed  Converging oceanic plate and continental plates – when continental plates and oceanic plate collide, the oceanic plate is subducted and volcanoes on land are formed  Converging continental plates – where two continental plates collide, the crust buckles and mountain ranges form.
  • 6.  The plates are moving at a very slow rate of about one to ten centimeters per year.  In areas plates are moving together and others are moving apart.