L7 Glacial Deposition Features
- 2. Lesson objectives To describe different landforms resulting from transportation and deposition and explain their formation: drumlins Lateral moraine Medial moraine Ground moraine terminal moraine Ref NT page 132 - 134
- 3. What is this? How would you describe it ? How is it formed ? What has this got to do with glaciation?
- 5. Moraines
- 6. Types of moraine Lateral moraine – material derived from freeze-thaw weathering of valley sides and which is carried at the sides of a glacier. Medial moraine – found in the centre of a glacier and results from two lateral moraines joining together. Ground moraine is material dragged underneath a glacier. Terminal moraine – marks the maximum advance of a glacier. It is the rock material deposited at the snout of a glacier. 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.
- 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?
- 9. Erratics Erratics are large b___________ carried by the ice and d__________ in an area of d___________ rock.
- 10. Drumlins Drumlins are smooth elongated m----- of material formed p-r--l-l to the d-r-c-i-n of ice movement. They are typically about 30 – 40m high and 300 – 400m long They often consist of stones and c--- and are thought to result from the --ad carried by a ------- becoming too heavy and being deposited.
- 11. 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 _________. blunt tapered Boulder clay downstream upstream
- 12. upstream downstream Blunt end Tapered end
- 14. Direction of ice flow