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Living in an active zone

Living in an active zone. Revision lesson. Why are plate margins hazardous?. What are the plate margins and how do plate movement generate a variety of landforms? What are the primary and secondary hazards associated with volcanoes and earthquake zones?

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Living in an active zone

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  1. Living in an active zone Revision lesson

  2. Why are plate margins hazardous? • What are the plate margins and how do plate movement generate a variety of landforms? • What are the primary and secondary hazards associated with volcanoes and earthquake zones? • Why do people continue to live in hazardous zones?

  3. The structure of the earth….. • THINK ABOUT WHAT THIS IMAGE HAS TO DO WITH THE EARTHS STRUCTURE? • YOU HAVE ONE MINUTE TO SEE IF YOU CAN COME UP WITH AN ANSWER • YOU MUST USE THE WORDS ; You will be selected at random to share your answer with the class!!  Core Mantle Crust

  4. Plates and Plate Boundaries 3 7 W Y Z 5 1 X 6 8 2 4 Test yourself –Name the plates 1 – 8 + Type of margins W-Z

  5. Destructive plate boundaries • Think about the direction that these plates move in….one of you will be selected at random to come to the front of the class to mime the motion of a destructive plate boundary! • No helping • No shouting out

  6. What can you remember?Match the letter with the number! hasvcjhvfgndtfgndfgfgngfnn hasvcjhv 2 3 1 4 A Oceanic crust B Continental crust c. Volcanic arc d. Trench

  7. What can you remember?Match the letter with the number! B Continental crust d. Trench A Oceanic crust c. Volcanic arc

  8. What happens at the destructive margin? Activity Put these in the correct order ! • As the pressure is released we get earthquakes. • Where plates move together, the denser oceanic crust slips down into the mantle under the continental crust. • An oceanic trench is formed on the sea bed. • Molten magma is forced to the surface where we get volcanoes eventually building a mountain range. • This movement builds up a large amount of pressure between the two plates. • The oceanic plate melts. This is known as the zone of subduction.

  9. Answers: 2 6 3 5 4 1 Can you remember what case study we used for this? The Andes

  10. Constructive plate boundaries • Think about the direction that these plates move in….one of you will be selected at random to come to the front of the class to mime the motion of a Constructive plate boundary! • No helping • No shouting out

  11. What can you remember?Match the letter with the number! 1 2 3 4 A. Sea floor spreading c. Magma b. Mid-oceanic rige d. Oceanic crust

  12. Strato and shield Volcano A Strato Shield B 6. Steep gradient 3. Destructive margin 1. layers of ash and lava 7. Gentle slopes 4. High summit 8. Wide profile 2. Constructive margin 5. Low height 10. Runny lava – spreads easily 9. Explosive eruptions

  13. Can you remember what case study we used for this? Iceland

  14. Primary or secondary hazards of a volcanic eruption? A. Primary B. Secondary 7. tsunamis 1. Lava flow 4. Pyroclastic flow 2. lahars 5. Ash and tephra falls 3. landslides 6. Volcanic gases

  15. Primary or secondary hazards of a volcanic eruption…answers  A. Primary B. Secondary 7. tsunamis 1. Lava flow 4. Pyroclastic flow 2. lahars 5. Ash and tephra falls 3. landslides 6. Volcanic gases

  16. Primary or secondary hazards of an earthquake? A. Primary B. Secondary 1. Ground shaking 2. landslides 3. tsunami 4. Soil liquifaction

  17. Primary or secondary hazards of an earthquake? A. Primary B. Secondary 1. Ground shaking 2. landslides 3. tsunami 4. Soil liquifaction

  18. Why do people live in hazardous zones? You have 2 minutes to come up with as many reasons as possible to explain why people live in risky areas! GO! Fertile soil Geothermal energy No choice Unwillingness to move Tourism

  19. How can the risks associated with volcanic and earthquake zones be reduced? • How are volcanoes monitored and what does this tell us about their state? • How might the effects of volcano eruptions and earthquakes be reduced in MEDCs and LEDCs?

  20. Answers: • T • F • F • T • F • F • T • F • F • T • T • F Short term or long term responses?True or false? Attempt the paper ‘true or false’ quiz

  21. Super volcanoes! • Watch the video clip (in lesson folder) • What might happen in the future – Yellowstone, USA

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