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Yr9 Revision Powerpoint Presentation Transcript

  • 1. ST IVO SCHOOL GEOGRAPHY DEPARTMENT
    REVISION FOR YEAR 9 VOLCANO EXAM
    Photos Courtesy of www.geographyphotos.com & R Chambers
  • 2. Structure Of The Earth
  • 3.
  • 4. At a constructive plate boundary, two plates move apart. As the two plates move apart, magma rises up to fill the gap. This causes volcanoes at this type of boundary. However, since the magma can escape easily at the surface the volcano does not erupt with much force.
    E.g. Mid-Atlantic Ridge.
    Constructive Plate Boundary
  • 5. A destructive plate boundary is found where a continental plate meets an oceanic plate.
    The oceanic plate subducts (sinks) under the continental plate because it is denser. Friction melts the plates. This melted plate is now hot, magma. If it reaches the surface, the liquid rock forms a volcano.
    E.g. Nazca and South American Plate
    Destructive Plate Boundary
  • 6. Conservative plate boundaries exist where two plates slide past each.
    No volcanoes are found along these plate boundaries, but earthquakes do occur.
    E.g. San Andreas Fault, San Francisco
    Conservative Boundary
  • 7. Collision boundaries occur when 2 continental plates move together. This causes the material between them to buckle and rise up, forming fold mountains.
    E.g. Himalayas
    Collision Boundary
  • 8. STRUCTURE OF A VOLCANO
    Steam, Ash, Gas
    Volcanic Bombs
    Crater
    Secondary Cone
    Lava Flow
    Vent
    Magma Chamber
  • 9. Minerals
    Geothermal Energy
    Tourism
    Why live near
    volcanoes?
    Fertile Soil
    Scientific Research
  • 10.
  • 11.
  • 12.
  • 13.
  • 14. Montserrat Case Study
    Montserrat is found in the Caribbean and is part of the Leeward Islands.
    It is part of a island arc and was formed by volcanic eruptions.
    North American Plate
  • 15. After 2 years of rumbling a huge eruption occurred on July 25 1997.
    In July 1995 the dormant volcano of Soufriére Hills started to rumble back to life.
    Montserrat is a Caribbean island famous for beautiful beaches and sea.
    Background Information
  • 16. Underneath Montserrat the North American plate is slowly being forced under the Caribbean plate.
    The Soufrière Hills Volcano produces a thick sticky lava.
    Montserrat is situated on a destructive plate boundary.
    The lava was thick and it built up at the top of the volcano in a dome until it collapsed.
    Causes of the Eruption
  • 17. Airport was evacuated and closed.
    Capital City (Plymouth) almost totally destroyed and evacuated.
    19 people killed and many more injured.
    A total of at least 4 square kilometres of land was covered by the pyroclastic flows and surges.
    People evacuated to the north of the island.
    Rich farmland destroyed by mudflows and covered by layers of ash.
    Destroyed between 100 -150 houses.
    About 8000 residents left the island to live somewhere safer.
    The southern part of the island is off limits and people are fined if they are found there.
    Effects of the Eruption
  • 18. INSTRUCTIONS
    There are 10questions for you to have a go at – as you work through the slides, write down the number of the question and your answer.
    At the end of the 10 questions – there are slides with the correct answers on for you to check your answers – GOOD LUCK!
  • 19. Question 1.
    Which of the following is an example of a volcanic eruption?
    Montserrat – 1997
    San Francisco – 1989
    Kobe – 1995
    Tokyo - 1919
  • 20. Question 2.
    Montserrat occurred at a..
    destructive boundary
    constructive boundary
    collision boundary
    conservative boundary
  • 21. Question 3.
    Re-arrange the following to give the correct order explaining the eruption of a volcano
    friction between plates and heat from the earth causes melting of the oceanic plate
    two plates move towards each other
    subduction of the lighter oceanic plate occurs
    molten magma rises and erupts
  • 22. Question 4.
    A constructive boundary is..
    where two plates move side by side
    where two plates move together
    where two plates move away from each other.
  • 23. Question 5.
    A collision boundary is where
    an oceanic and a continental plate meet
    two continental plates meet
    two oceanic plates meet
    two plates move away from each other
  • 24. Question 6.
    At this boundary two plate move apart from each other
    collision boundary
    constructive boundary
    destructive boundary
    conservative boundary
  • 25. Question 7.
    At this boundary two plates of continental crust meet
    collision boundary
    constructive boundary
    conservative boundary
    destructive boundary
  • 26. Question 8.
    Here an oceanic and continental plate move together..
    destructive Boundary
    constructive boundary
    conservative boundary
    collision boundary
  • 27. Question 9.
    The outer layer of the earth is called the..
    crust
    mantle
    core
  • 28. Question 10.
    This process occurs where two plates meet together..
    precipitation
    subduction
    transpiration
    divergence
  • 29. Answers Slide
    Question 1.
    Which of the following is an example of a volcanic eruption?
    Montserrat – 1991
    San Francisco – 1989
    Kobe – 1995
    Tokyo - 1919
  • 30. Answers Slide
    Question 2.
    Montserrat occurred at a..
    destructive boundary
    constructive boundary
    collision boundary
    conservative boundary
  • 31. Question 3.
    Re-arrange the following to give the correct order explaining the eruption of a volcano
    Answers Slide
    friction between plates and heat from the earth causes melting of the oceanic plate
    two plates move towards each other
    subduction of the lighter oceanic plate occurs
    molten magma rises and erupts
    3
    1
    2
    4
  • 32. Answers Slide
    Question 4.
    A constructive boundary is..
    where two plates move side by side
    where two plates move together
    where two plates move away from each other.
  • 33. Answers Slide
    Question 5.
    A collision boundary is where
    an oceanic and a continental plate meet
    two continental plates meet
    two oceanic plates meet
    two plates move away from each other
  • 34. Answers Slide
    Question 6.
    At this boundary two plate move apart from each other
    collision boundary
    constructive boundary
    destructive boundary
    conservative boundary
  • 35. Answers Slide
    Question 7.
    At this boundary two plates of continental crust meet
    collision boundary
    constructive boundary
    conservative boundary
    destructive boundary
  • 36. Answers Slide
    Question 8.
    Here an oceanic and continental plate move together..
    destructive Boundary
    constructive boundary
    conservative boundary
    collision boundary
  • 37. Answers Slide
    Question 9.
    The outer layer of the earth is called the..
    crust
    mantle
    core
  • 38. Answers Slide
    Question 10.
    This process occurs where two plates meet together..
    precipitation
    subduction
    transpiration
    divergence