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Southern Alps

Southern Alps. Key surface features: High mountain ranges (1 st ) V -shaped valleys and jagged ridges (2 nd ) Internal processes: Convection currents move the plates Both plates colliding (destructive plate boundary) leading to uplift External processes:

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Southern Alps

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  1. Southern Alps Key surface features: • High mountain ranges (1st) • V-shaped valleys and jagged ridges (2nd) Internal processes: • Convection currents move the plates • Both plates colliding (destructive plate boundary) leading to uplift External processes: • Weathering by ice, water, wind, bio • Erosion of sediment and deposition on the plains • Three processes must be linked to the surface features for E. At least one internal and one external process is needed (last one can be either). • One of each must be linked for M. • All info must be in the context

  2. Step one Find/draw a diagram (cross section) to show the three ideas: • Surface features • Internal processes • External processes Annotate this diagram (around the diagram or refer to in the report).

  3. Step two • A description of the surface features: • Mountain ranges • V-shaped valleys and ridges • Canterbury plains

  4. Step three Explain the first internal process that has caused the mountain ranges to form. • Convection currents (explain how they occur) • Name the two plates that the sounds are found on • Link the direction of the current to how the plates are moving • What type of plate boundaries has this caused? • When was this happening? (most recently)

  5. Step four Explain the second internal process that has caused the mountain ranges to form. • What type of plate boundary has this caused? • When was this happening? (most recently) • Where has uplift occurred (why did subduction not occur?) • What type of rocks were being exposed (age type?) • CONTEXT, CONTEXT – LINK TO THE SURFACE FEATURES

  6. Step 5 Explain the first external process that reduced the height of the southern alps • Weathering and erosion • The cold winters and frost cracking • Weathering due to melting snow/water • Erosion of rock due to wind and water • Change in the appearance of the mountains over time, due to the above.

  7. Step 6 Explain the second external process that has impacted the appearance of the South Island. • Erosion of weathered rock • Transportation by rivers that flow down the valleys • Deposition of sediment forming the Canterbury plains

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