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L3 plate boundaries


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  • 1. Plate boundaries compared Objective: To be able to draw a diagram, describe the features and explain theprocesses occurring at each plate boundary
  • 2. 1) Describe the distribution of plate boundaries (3 marks)2) Identify the type of plate boundary or boundaries found between:a) The African and the Eurasian plateb) The Indo Australian plate to the east of India and the Eurasian platec) The Eurasian plate and the North American plate1 mark for each correct answer for question 2
  • 3. Peer Assessment• 1) The distribution of plate boundaries is very uneven (1 mark). However, they are often found on the edge of continents (1 mark) e.g. North and South American (1 mark) or in the middle of the ocean (1 mark) e.g. the mid Atlantic (1 mark).• 2) (a) Destructive ( 1mark)• (b) Collision zone (1 mark)• (c) A constructive boundary (1 mark)
  • 4. Plate Boundaries Compared Conservative margin
  • 5. Conservative plate boundary
  • 6. Plate Boundary and Explanation Earthquakes VolcanoesExampleConservative •Plates slide past High magnitude • None each other = Crust earthquakesSan Andreas fault- neither created orNorth American destroyed becauseand Pacific plates no magma or(sliding past each subductionother in the same •Friction betweendirection) plates = extreme stress builds in crustal rocks when released = earthquake •Longer period of movement = more stress build up so when released = more energy significant earthquake
  • 7. Constructive plate boundary f
  • 8. Destructive plate boundary
  • 9. Collision Zone
  • 10. Tasks• Complete the rest of the table using p14 Purple Book and p14 Green Book
  • 11. Plate Boundary Explanation Earthquakes Volcanoesand ExampleConstructive •New basaltic material rises • Low magnitude Shield Volcanoes not to the surface forcing earthquakes very explosive or•Iceland on the oceanic plates apart maximum 6 on dangerousmid-Atlantic •Hot magma is able to fill Richter Scale Erupt basic lava andridge the the “gap” creating new occur in fissuresEurasian and crust. (cracks in the crust)North American •As magma continues toplates are pulling build up new mountainapart ranges form under sea = mid-ocean ridge •Magma continues to rise until eventually above sea = volcanic island
  • 12. Plate Boundary and Explanation Earthquakes VolcanoesExampleDestructive •Oceanic crust The highest Very explosive and destroyed magnitude dangerousAndes Mountains in •Oceanic plate earthquakes volcanoes withPeru and Chiles subducts under less recorded occur here steep sides calledwhere Nazca dense continental composite coneoceanic plate is plate forming fold volcanoessubducted under mountains in the Erupt andesitic lavathe continental processSouth American •Magma risesplate through weaknesses melting crust forming volcanoes
  • 13. Plate boundary and •Processes Earthquakes VolcanoesExampleCollision Zone •Two continental Very high None because no plates moving magnitude material isHimalayas towards each other earthquakes subductedIndian and Eurasian •Same density so nocontinental plate subduction occurscrash into each this cause the crustother to buckle and fold creating fold mountains • No volcanoes occur here as subduction does not occur •Crust neither formed or destroyed