L7 Glacial Deposition Features

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L7 Glacial Deposition Features

  1. 1. Glacial deposition features
  2. 2. Lesson objectives <ul><li>To describe different landforms resulting from transportation and deposition and explain their formation: </li></ul><ul><li>drumlins </li></ul><ul><li>Lateral moraine </li></ul><ul><li>Medial moraine </li></ul><ul><li>Ground moraine </li></ul><ul><li>terminal moraine </li></ul><ul><li>Ref NT page 132 - 134 </li></ul>
  3. 3. What is this? How would you describe it ? How is it formed ? What has this got to do with glaciation?
  4. 5. Moraines
  5. 6. Types of moraine <ul><li>Lateral moraine – material derived from freeze-thaw weathering of valley sides and which is carried at the sides of a glacier. </li></ul><ul><li>Medial moraine – found in the centre of a glacier and results from two lateral moraines joining together. </li></ul><ul><li>Ground moraine is material dragged underneath a glacier. </li></ul><ul><li>Terminal moraine – marks the maximum advance of a glacier. It is the rock material deposited at the snout of a glacier. </li></ul><ul><li>Recessional moraines – these form behind and parallel to the terminal moraine. They mark stages in the retreat of a glacier when it remained stationary for long enough for a ridge of material to develop. </li></ul>
  6. 8. What is this? How did it get to be like this? How would you describe it ? How is it formed ? Why is the bed rock a different colour than the boulder? What has this got to do with glaciation? What processes have occurred?
  7. 9. Erratics <ul><li>Erratics are large b___________ carried by the ice and d__________ in an area of d___________ rock. </li></ul>
  8. 10. Drumlins <ul><li>Drumlins are smooth elongated m----- of material formed p-r--l-l to the d-r-c-i-n of ice movement. </li></ul><ul><li>They are typically about 30 – 40m high and 300 – 400m long </li></ul><ul><li>They often consist of stones and c--- and are thought to result from the --ad carried by a ------- becoming too heavy and being deposited. </li></ul>
  9. 11. <ul><li>Most deposition occurs around the _______end which forms the drumlin’s ______ end. The rest of the _______ that is deposited is then moulded into shape by the moving ice to form the _______ end _________. </li></ul>blunt tapered Boulder clay downstream upstream
  10. 12. upstream downstream Blunt end Tapered end
  11. 14. Direction of ice flow

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