2. Periglacial landforms
You should be able to describe and explain the formation of various periglacial landforms including
Tors
Blockfields
Pingos
Ice wedges
Patterned ground
Talus
Solifluction lobes

3. Patterned ground

4. Ice Wedges

5. Describe and explain the formation of open and closed system Pingos

6. Periglacial landforms
Periglacial landforms
Patterned ground
Open system pingos
Closed system pingos
Solifluction sheets and lobes
Tors
Ice wedge polygons
Nivation hollows
Talus (scree)
Blockfields
Key features (size, shape, appearance)
Processes involved
Explanation of how created
Located Example

7. Freeze Thaw, Capillary action Formation of Ice lenses
Open system pingos
Large domes up to 50m high and 300m across. Circular in shape with a core of ice and surface of soil.
Freeze Thaw, Capillary action
Formation of Ice lenses
Open system pingos occur in valley bottoms where water moves to the base of the valley during the thaw season when the active layer has thawed. When temperature drops ice lenses can form in this location. Water migrates to these lenses by capillary action. On contact with the ice lenses the water freezes, swelling the size of the lense.
Over time this will swell the size of the land surface to create round hills called pingos. When the pingo becomes too large cracks appear on the surface. This exposes the ice to the sun and melting occurs. The pingo collapses leaving a lake (ognip) surrounded by a ridge or rampart.
East Greenland

8. Locate your case studies of landforms on the map below

9. Name the features on the diagram
Attempt question 5 and 7 on page 139 of Waugh
Research question 8