What Happens At A Destructive Plate Boundary Bv

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What Happens At A Destructive Plate Boundary Bv

  1. 1. What happens at a destructive plate boundary?
  2. 2. What are these slabs of the Earth’s crust called? What processes going on in which layer of the Earth cause the plates to move?
  3. 3. Plates move? <ul><li>They can move Together </li></ul><ul><li>Apart </li></ul><ul><li>Or slide past each other </li></ul><ul><li>But there is one more complication ….. </li></ul><ul><li>There are two types of plates </li></ul><ul><li>Oceanic dense Sima basalt </li></ul><ul><li>Continental lighter Sial granite </li></ul>
  4. 4. So where are they? http://earthquake.usgs.gov/learning/topics/plate_tectonics/plates.php
  5. 5. <ul><li>DESTRUCTIVE PLATE BOUNDARY </li></ul><ul><li>(= CONVERGENT) </li></ul>This is where two plates, one made up of continental crust and one of oceanic crust move towards each other . The oceanic crust is pushed downward under the other plate and destroyed.
  6. 6. Destructive plate margins volcanoes Deep focus earthquakes Shallow focus earthquakes Subduction zone Mantle Continental crust Oceanic crust Oceanic trench ocean Explain why fold mountains, volcanoes and earthquakes occur along destructive plate margins…..
  7. 7. Hint slide…. <ul><li>At a destructive plate margin an oceanic plate and a continental plate are moving ________ (together, apart). The oceanic crust is _____ (lighter, denser) than the continental one, so the oceanic plate sinks along a ---------- ----. The friction between the two plates causes -----------. </li></ul><ul><li>The land on the edge of the continental crust gets pushed up to make ---- --------- e.g. the Andes. </li></ul><ul><li>The oceanic crust melts as it goes into the _____ (crust, mantle, core). Because it takes some sea water with it, it’s less dense than the mantle around it. This makes the molten material (-----) rise. It then explodes at the surface as a -------. The trapped sea water turns into steam and this makes the volcanoes very explosive with a lot of ash, steam and gas given off. </li></ul>
  8. 8. Example of destructive plate boundary Name the two plates involved In which direction are they moving? What mountain range can be seen here? What is this feature? How can you tell that this is a destructive plate boundary? What is the evidence?
  9. 9. Collision boundary What is happening at this type of destructive plate margin? Would you expect to find earthquakes here? Why? Would you expect to find volcanoes here? Why Give an example of a mountain range formed by the meeting of two continental plates.

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