Glacial Features: Task 1

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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:

Glacial Features: Task 1 Sort your glacial features into the following categories: Erosion Ice sheet scouring Ice contact depositional Lowland/subglacial depositional Fluvioglacial (ice contact) Fluvioglacial (proglacial)

Ice contact deposition subglacial deposition Task 1 - ANSWERS Erosion Ice sheet scouring Ice contact deposition Lowland/ subglacial deposition Fluvio (ice contact) Fluvio (proglacial) Cirques/ corries Arêtes Pyramidal peaks Glacial troughs Truncated spurs Hanging valleys Ribbon lake Roche moutonees Knock and lochan Crag and tail Medial moraine Lateral moraine Recessional moraine Terminal moraine Drumlins Till Kames/ kame terraces Eskers Sandurs Proglacial lakes Kettleholes

Task 2 Explain how were they formed. Each of these questions (in theory) is worth around 3 marks. Answers on whiteboards to be peer marked by another pair. Before you start, we will have chance to discuss what it is so everyone is on the same page!

What is it?

Explain how moraine is formed. How many types of moraine can you remember? How are they formed? Remind yourself – 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

What is it?

Explain how roche moutonnee are formed. Roche Mountonnee Explain how roche moutonnee are formed. How are they formed? Stoss? Lee? Remind yourself – 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

What is it?

Explain how corries are formed. Corrie/Cirque Explain how corries are formed. How are they formed? Start from the beginning of the story. Remind yourself – erosion, ice sheet scouring, ice contact deposition, lowland deposition, fluvioglacial?

Corrie/Cirque Aspect determines whether snow will build up over time (shaded area) Lowest layers of snow are compressed and become glacial ice Shear stress causes glacier to start to slip (rotational movement) Abrasion in the base, plucking on the back wall

What is it?

Kames and Kettleholes Explain how kames and kettleholes are formed (this would be more like 6 marks). How are they formed? Remind yourself – erosion, ice sheet scouring, ice contact deposition, lowland deposition, fluvioglacial?

When glacier retreats/melts, these sediments form mounds (kames) Kames and Kettleholes During glaciation, gaps in the ice or in crevasses cause sediment to be deposited When glacier retreats/melts, these sediments form mounds (kames) Where the ice once separated these mounds is left as a lake (kettlehole)