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Yr9 volcanoes revision

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Revision points for volcano end of unit test.

Revision points for volcano end of unit test.

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  • 1. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk REVISION FOR YEAR 9 VOLCANO EXAM ST IVO SCHOOL GEOGRAPHY DEPARTMENT Photos Courtesy of www.geographyphotos.com & R Chambers
  • 2. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Structure Of The Earth
  • 3. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk
  • 4. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Constructive Plate Boundary 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.
  • 5. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk 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. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk 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. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk 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. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk STRUCTURE OF A VOLCANO Crater Magma Chamber Vent Secondary Cone Lava Flow Steam, Ash, Gas Volcanic Bombs
  • 9. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Fertile Soil e.g. Mt Etna Scientific Research e.g. Mt St Helens Geothermal Energy e.g. Iceland Minerals e.g. gold and copper, Mt St Helens Tourism e.g. Mt Fuji
  • 10. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk
  • 11. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk
  • 12. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk
  • 13. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk
  • 14. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk • 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 Montserrat Case Study
  • 15. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk 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. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Underneath Montserrat the North American plate is slowly being forced under the Caribbean plate. The lava was thick and it built up at the top of the volcano in a dome until it collapsed. The Soufrière Hills Volcano produces a thick sticky lava. Montserrat is situated on a destructive plate boundary. Causes of the Eruption
  • 17. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Airport was evacuated and closed. 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. Capital City (Plymouth) almost totally destroyed and evacuated. 19 people killed and many more injured. Destroyed between 100 -150 houses. About 8000 residents left the island to live somewhere safer. Rich farmland destroyed by mudflows and covered by layers of ash. The southern part of the island is off limits and people are fined if they are found there. Effects of the Eruption
  • 18. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk INSTRUCTIONS There are 10 questions 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. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 1. Which of the following is an example of a volcanic eruption? a. Montserrat – 1997 b. San Francisco – 1989 c. Kobe – 1995 d. Tokyo - 1919
  • 20. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 2. Montserrat occurred at a.. a. destructive boundary b. constructive boundary c. collision boundary d. conservative boundary
  • 21. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 3. Re-arrange the following to give the correct order explaining the eruption of a volcano a. friction between plates and heat from the earth causes melting of the oceanic plate b. two plates move towards each other c. subduction of the lighter oceanic plate occurs d. molten magma rises and erupts
  • 22. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 4. A constructive boundary is.. a. where two plates move side by side b. where two plates move together c. where two plates move away from each other.
  • 23. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 5. Which of these does NOT occur at a constructive boundary? a. a mid ocean ridge b. volcanoes c. earthquakes d. fold mountains
  • 24. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 6. At this boundary two plate move apart from each other a. collision boundary b. constructive boundary c. destructive boundary d. conservative boundary
  • 25. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 7. At this boundary two plates of continental crust meet a. collision boundary b. constructive boundary c. conservative boundary d. destructive boundary
  • 26. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 8. Here an oceanic and continental plate move together.. a. destructive Boundary b. constructive boundary c. conservative boundary d. collision boundary
  • 27. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 9. The outer layer of the earth is called the.. a. crust b. mantle c. core
  • 28. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 10. This process occurs where two plates meet together.. a. precipitation b. subduction c. transpiration d. divergence
  • 29. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 1. Which of the following is an example of a volcanic eruption? a. Montserrat – 1991 b. San Francisco – 1989 c. Kobe – 1995 d. Tokyo - 1919 Answers Slide
  • 30. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 2. Montserrat occurred at a.. a. destructive boundary b. constructive boundary c. collision boundary d. conservative boundary Answers Slide
  • 31. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 3. Re-arrange the following to give the correct order explaining the eruption of a volcano a. friction between plates and heat from the earth causes melting of the oceanic plate b. two plates move towards each other c. subduction of the lighter oceanic plate occurs d. molten magma rises and erupts Answers Slide 3 1 2 4
  • 32. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 4. A constructive boundary is.. a. where two plates move side by side b. where two plates move together c. where two plates move away from each other. Answers Slide
  • 33. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 5. Which of these does NOT occur at a constructive boundary? a. a mid ocean ridge b. volcanoes c. earthquakes d. fold mountains Answers Slide
  • 34. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 6. At this boundary two plate move apart from each other a. collision boundary b. constructive boundary c. destructive boundary d. conservative boundary Answers Slide
  • 35. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 7. At this boundary two plates of continental crust meet a. collision boundary b. constructive boundary c. conservative boundary d. destructive boundary Answers Slide
  • 36. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 8. Here an oceanic and continental plate move together.. a. destructive Boundary b. constructive boundary c. conservative boundary d. collision boundary Answers Slide
  • 37. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 9. The outer layer of the earth is called the.. a. crust b. mantle c. core Answers Slide
  • 38. Year 9 Geography Revision St Ivo School Geography Department www.geobytes.org.uk Question 10. This process occurs where two plates meet together.. a. precipitation b. subduction c. transpiration d. divergence Answers Slide