Mt Tongariro   Key Features
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Mt Tongariro Key Features

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Mt Tongariro - Key features

Mt Tongariro - Key features

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Mt Tongariro   Key Features Mt Tongariro Key Features Presentation Transcript

  • Mt Tongariro
    • ‘ Tongariro is not a simple mountain, but a highly complex volcanic system’
      • Bernard Friedlander (1898)
  • Five key concepts
    • Draw a table into your books
    Ten Key Concepts for Mt Tongariro
  • Cones
    • Ngauruhoe is one of the many cones of Tongariro, it has been built by a large number of eruptions
  • Vents
    • Many of Tongariro’s explosions vents are active, with Ngauruhoe being the most active
  • Craters
    • The central and south craters of Tongariro are now believed to be depressions and not explosion centres , so are not true craters
  • Dykes and Sills
    • The unusual feature in the Red crater is a dyke
    • Sills and dykes may help to reinforce the structure of the volcano, but may in time be exposed by erosion
    • The feature in the yellow oval is a dyke
      • The magma rose to the surface through a crack and sank again without reaching the surface
      • Lava cooled and hardened on the outside but the centre retreated, leaving it hollow
      • The dyke was revealed when the surface of the crater was eroded
  • Hot springs and fumeroles
    • Magma sometimes takes thousands of years to cool and remains just below the surface
    • The escaping gases heat ground water and generates steam
    • Ketetahi springs, Te Mari and Red craters are examples
  • Mt Ruapehu
    • Why is Mt Ruapehu the most ‘hazardous’ mountain in the TVC?
    • Use text from page 27, 28, 29, 30 to write answering
      • Why is Mt Ruapehu the most hazardous volcanic cone in the TVC?
      • How may these hazards be minimised?
    • 1,000 – 1,500 words
    • Pick out bullet points from the text first
    • Organise ideas into paragraphs
    • Then write into essay form with intro, body and conclusion
    • These will be marked, hand in on Wed 26/03/08
    Essay