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AS 90935

AS 90935. Key surface features: High mountain ranges (1 st ) U-shaped valleys (2 nd ) Internal processes: Convection currents move the plates Both plates colliding (destructive plate boundary) leading to uplift External processes: Glaciers acting as a weathering and erosion agent

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AS 90935

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  1. AS 90935

  2. Key surface features: • High mountain ranges (1st) • U-shaped valleys (2nd) Internal processes: • Convection currents move the plates • Both plates colliding (destructive plate boundary) leading to uplift External processes: • Glaciers acting as a weathering and erosion agent • Rise and fall of sea level • 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

  3. 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).

  4. Step two • A description of the surface features: • Mountain ranges • U-shaped valleys

  5. 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)

  6. 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 What type of rocks were being exposed (age type?) • CONTEXT, CONTEXT – LINK TO THE SURFACE FEATURES

  7. Step 5 Explain the first external process that has caused the U-shaped valleys to form. • Ice ages and interglacial periods • Cooler periods cause ice to accumulate in the crevices between the mountains (forming glaciers) • Warmer periods cause the glaciers to move down the mountain • During this process large rocks are weathered and eroded away • Detail into the weathering and erosion • Retreating of the glaciers leaving behind the valley

  8. Step 6 Explain the second external process that has caused the U-shaped valleys to form. • The glaciers retreated (due to periods of warming) • Sea level rises • Bottom of the valley is filled by water

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