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Plate Boundaries

Plate Boundaries. Plate Boundaries. Why do we care about plate boundaries?. Plate Boundaries. Volcanoes and earthquakes most often occur where tectonic plates come together. At plate boundaries, many other geologic features, such as mountains and rift valleys, can also occur.

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Plate Boundaries

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  1. Plate Boundaries

  2. Plate Boundaries Why do we care about plate boundaries?

  3. Plate Boundaries Volcanoes and earthquakes most often occur where tectonic plates come together. At plate boundaries, many other geologic features, such as mountains and rift valleys, can also occur.

  4. Plate Boundaries There are three basic types of plate boundaries: 1. Divergent 2. Convergent 3. Transform Fault Boundary

  5. Divergent Boundary A divergent boundary occurs where two plates move apart and create a gap between them.

  6. Divergent Boundary Hot rock rises from asthenosphereand cools to form new lithospheric rock. Diverging plates then pull newly formed lithosphere away from gap. New lithospheric (oceanic crust) is formed.

  7. Divergent Boundary Mid-oceanic ridges are mountain ranges at divergent boundaries in oceanic crust.

  8. Divergent Boundary Real Life Example: Mid-Atlantic Ridge Mid-Atlantic Ridge runs through Atlantic Ocean from Arctic Ocean to an area off the southern tip of South America.

  9. Convergent Boundary A convergent boundary occurs where two plates move toward one another.

  10. Convergent Boundaries There are two types of convergent boundaries: 1. Subduction 2. Collision

  11. Convergent Boundary - Subduction Subduction is the process by which one lithospheric plate moves beneath another plate.

  12. Convergent Boundary - Subduction • Ocean – Ocean • Two oceanic plates collide • Generates volcanoes • Generates island chains • Real World Example • Japan

  13. Convergent Boundary - Subduction • Ocean – Continent • Oceanic and continental plate collide • A thin, dense oceanic plate collides with a relatively light, thick continental plate, the oceanic plate is forced under the continental plate • Real World Example • Andes Mountains

  14. Convergent Boundary - Collision • Continental – Continental • Two continental plates collide • Real World Example • Himalayas

  15. Transform Fault Boundary A transform fault boundary occurs where two plates slide past one another.

  16. Transform Fault Boundary • Plate movement at transform fault boundaries is one cause of earthquakes. • Real World Example • San Andreas Fault

  17. http://www.wwnorton.com/college/geo/egeo/animations/ch2.htm http://www.classzone.com/books/earth_science/terc/content/visualizations/es0804/es0804page01.cfm?chapter_no=08

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