Plate Boundaries2

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  • 1. P l a t e b o u n d a r i e s
  • 2. A n i n t r o d u c t i o n
    • There are 3 types of plate boundaries, passive, compressional and tensional. I will explain each one in further detail and then and name a place study which you need to know for the exam.
  • 3. P a s s i v e p l a t e b o u n d a r i e s
    • This is where the two plates slide horizontally past each other. No land is ever created and no is ever destroyed.
    • Earthquakes are very common and this plate boundary but volcanoes never occur.
    • Most of these are found on the bed of the ocean.
  • 4. C a s e s t u d y
    • San Andreas fault in San Francisco. The zone is roughly 1,300km long and in places is tens of kilometre wide. It slices through two thirds of the length of California.
  • 5. Diagram This is exactly what I have just explained but it diagram form .
  • 6. c o m p r e s s i o n a l p l a t e b o u n d a r i e s
    • The compressional plate boundary is where the plates are forced towards each other.
    • The continental plate which is heavier and carries land subducts the lighter plate which carries ocean hence the name the oceanic crust.
    • As it is forced below in the subduction zone it melts and this creates magma. The magma starts to collect in the magma chamber and eventually starts to rise through the cracks in the continental crust.
    • This causes lots of pressure to build up over time. As a result of a compressional plate boundary fold mountains, earthquakes and volcanoes are often formed.
  • 7. C a s e s t u d y
    • As a result of a compressional plate boundary fold mountains, earthquakes and volcanoes are often formed. Our case study for compressional boundaries is Fold mountains in the Alps.
  • 8. Diagram This is exactly what I have just explained but it diagram form .
  • 9. T e n s i o n a l p l a t e b o u n d a r i e s
    • This is when the plates move apart. They do this because of convection currents in the centre of the earth.
    • As the plates gradually move apart the magma rises from the centre of the earth and sets on the earth’s surface.
    • When it cools and solidifies this forms a new layer of igneous rock, over a long period of time this process is repeated several times .
  • 10. C a s e s t u d y
    • Mid-Atlantic ridge, this runs between the North American and Eurasian plates.
  • 11. Diagram This is exactly what I have just explained but it diagram form .