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CLIP 3074

The Rakaia river valley, New Zealand

The Rakaia river valley, New Zealand
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Key Info
  • The Rakaia river valley, New Zealand
  • Duration: 04:36
  • The Rakaia river is fed by glaciers in the New Zealand Alps. During the winter blizzards pound the mountains and in the summer the glacial ice melts. New Zealand is in a mountain-building period and earthquakes are frequent. The river seeps out from under the moraine into a lake. This forms the source of the Rakaia. Landslips and erosion create scree slopes. This, together with freeze-thaw weathering, creates a huge amount of material for the river to carry away.
  • Subject:

    Geography

       Topic:

    Glaciation

  • Keywords: landscapes, South Island, glaciated mountains, snowmelt, precipitation, ice, moraine, lake, source, fan, erosion
Ideas for use in class
  • This clip could be used in a module on rivers, glaciation or weathering and erosion. The river profile of the Rakaia could be contrasted with that of a UK river. The seasonal variation in glaciers could also be studied. Alternatively, there is an excellent animation of freeze-thaw weathering and some good images of scree slopes.
Background details
  • Clip language : English
  • Aspect ratio : 4x3

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