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Major Geological Events

Major Geological Events

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Major Geological Events

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Presentation Transcript

  1. Major Geological Events Caused by Plate Tectonics

  2. Types of Boundaries • Divergent   • Plates move apart • Convergent  • Plates come together • Transform • Plates slide horizontally past each other

  3. Divergent Structures • New crust is formed as plates pull apart • Land features include: • Mid-Ocean Ridges Ex. - Mid-Atlantic Ridge • Rift Valleys Ex. - African Rift Valley • Earthquakes

  4. Mid–Ocean Ridge (Location of Sea Floor Spreading)

  5. Sea Floor Spreading (Mid-Ocean Ridge) Younger Older Older Divergent Structure

  6. Rift Valley Divergent Structure

  7. Convergent Boundaries • Crust is destroyed and recycled back into the mantle • Three types of convergent collisions • Features include: • Trenches – Mariana Trench • Volcanic Arc (Volcanic Mountains) – Andes mountains • Mountain Ranges – Himalayan Mountains • Earthquakes

  8. Subduction • Result of convergent boundary • A more dense plate slides under a less dense plate and sinks into the mantle. • Features include: • Oceanic-Oceanic = Trenches • Oceanic-Continental = Mountain Ranges

  9. Subduction Examples

  10. Convergent Boundary • Oceanic-Oceanic • Land Features – Trench and Island Arc Oceanic-Oceanic convergence

  11. Convergent Boundary • Oceanic-Continental • Land Features – Trench and Volcanic Arc (Volcanic Mountains) Oceanic-Continental convergence

  12. Convergent Boundary • Continental-Continental • Land Features – Folded Mountains Continental-Continental convergence

  13. Mountain Ranges

  14. Transform Fault Structures • Crust is neither destroyed nor created • Can occur between two oceanic plates or oceanic-continental plates • Features include: • Earthquakes • Fault line – San Andreas Fault

  15. Transform Boundary • Oceanic-Oceanic • Land Feature – Fault Line

  16. Transform Boundary San Andreas Fault Line

  17. Transform Boundary • Continental-Continental • Land Features – Fault Line

  18. Earthquakes – All Boundaries

  19. Volcanoes

  20. Mountain Ranges

  21. Putting It All Together

  22. Plate Boundaries

  23. Plate Movement