Geography

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Author:
Deraj
ID:
110187
Filename:
Geography
Updated:
2011-10-19 22:23:52
Tags:
Geography Lake Taupo Drainage Basin
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Description:
Natural Processes - Lake Taupo Drainage Basin
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  1. What is the size and extent of the Lake Taupo Drainage Basin?
    • Natural - 95km long, 70km wide
    • Modifyed - 110km long, 70km wide

    Extends from the outlet of the Waikato River in the North to the andesitic volcanoes in the South.
  2. What type of rock can be found in most of the drainage basin?
    Igneous or volcanic, these are formed by volcanic eruptions
  3. Where would you find Sedimentary rock in the Lake Taupo Drainage Basin?
    In the Hauhungaroa and Kaweka ranges
  4. Please explain how the process of folding works
    Well, the core heats the magma which rises, as it gets to the surface it cools and moves outward which in turn moves the plates. When the plates push together if the rock is soft it will buckle and be pushed up and folding has occured
  5. Please explain the process of faulting works
    The sudden release of pressure along a line of weakness causes the ground to move. This resulted in the Rotorua Taupo grabin
  6. Explain the characteristics of Basalt
    Hot, liquid, dark coloured, very runny. The type of landforms which form are gentlysloping.
  7. Now, explain the characteristics of Andesite
    Intermediate in thickness, colour and mineral content. Ruapehu is an Andesite volcano
  8. Explain the characteristics of Rhyolite
    Thick, highly explosive, forms steep cumuldo domes, Lake Taupo is a Rhyolite volcano
  9. What is extrusive effusive processes?
    It means it is forced out and flows as lava on the land surface. eg aa, shield volcanoes, Domes
  10. What is Extrusive Explosive volcanic processes?
    Causes magama to built high levels of pressure resulting in powerful explosions. eg Lake Taupo, ring plains, caldera's
  11. What happened in stage 1 of the Taupo Eruption?
    Minor eruptions, water mixed with gas rich magma
  12. What happened in stage 2?
    Pressure below the vent area gave way and Coarser pumice erupted 30km, winds transfered this over 10,000 square km
  13. And in stage 3?
    Ground surface deflated and water flowed back into the vent, the resulting ash covered the area in a white blanket
  14. How about stage 4?
    Magma meet lake water to produce a high water rich eruption plume
  15. Stage 5?
    Water and pumice was forced up into the stratosphere, pumice rained over the central North Island
  16. And finaly in stage 6?
    A massive amount of hot pumice gas and rock raced outward from the vent in all directions at 600-900km a hour, this created the Taupo ignumbrite. This pyroclastic flow covered land up to 1500m high, Ruapehu was the only mountain high enough to block or divert the flow.

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