Task 1 Same as yesterday…

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1) What are the main geomorphological processes shaping landforms in an area undergoing active glaciation? 2) Show how one named landform has been shaped.

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Presentation transcript:

Task 1 Same as yesterday… Sort your glacial features into the following categories: Periglacial Erosion Ice sheet scouring Ice contact depositional Lowland depositional Fluvioglacial

Ice contact deposition Task 1 - ANSWERS Periglacial Erosion Ice sheet scouring Ice contact deposition Lowland deposition Fluvioglacial Ice wedges Patterned ground Pingos Loess Cirques/ corries Arêtes Pyramidal peaks Glacial troughs Truncated spurs Hanging valleys Ribbon lakes Roche moutonees Knock and lochan Crag and tail Medial moraine Lateral moraine Recessional moraine Terminal moraine Drumlins Till plains Lodgement till Kames/ kame terraces Eskers Sandurs Proglacial lakes Meltwater channels Kettleholes

Task 2 How were they formed?

Discuss the following: What is it? Discuss the following: What is it? (depends how good their model is!) How is it formed? Remind yourself – periglacial, erosion, ice sheet scouring, ice contact deposition, lowland deposition, fluvioglacial?

Patterned Ground Ice lens in ground gets bigger Periglacial Ice lens in ground gets bigger Forces sediment up towards surface (frost heave) Once on surface, larger stones roll down sides of raised land Creates rings called patterned ground

SWITCH

Discuss the following: What is it? Discuss the following: What is it? (depends how good their model is!) How is it formed? Remind yourself – periglacial, erosion, ice sheet scouring, ice contact deposition, lowland deposition, fluvioglacial?

Medial: in the middle of two glaciers (used to be lateral) Moraine Ice contact depositional Material picked up and transported by the glacier (often scree from valley sides which has fallen due to freeze thaw) Medial: in the middle of two glaciers (used to be lateral) Lateral: at the sides

SWITCH

Discuss the following: What is it? Discuss the following: What is it? (depends how good their model is!) How is it formed? Remind yourself – periglacial, erosion, ice sheet scouring, ice contact deposition, lowland deposition, fluvioglacial?

Roche Mountonee Glacial ice meets a different rock type in bedrock Erosion Glacial ice meets a different rock type in bedrock Can’t erode so has to flow over Smoothes over the stoss side (abrasion) Plucking occurs on lee side

SWITCH

Discuss the following: What is it? Discuss the following: What is it? (depends how good their model is!) How is it formed? Remind yourself – periglacial, erosion, ice sheet scouring, ice contact deposition, lowland deposition, fluvioglacial?