Glacial Systems & Landscapes: Glacial Landforms
- Created by: IssyCalderwood
- Created on: 08-01-19 12:22
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- Glacial Landforms
- Corries
- Glaciers form on side of mountain peak (least sun/coldest winds) most accumulation/least ablation
- Snow collects in hollows and becomes ice.
- Basal sliding (rotational flow) + abrasion + plucking = hollow deepens into corrie
- Ice thick enough flows over lip/flows downhill as glacier
- Basal sliding (rotational flow) + abrasion + plucking = hollow deepens into corrie
- Snow collects in hollows and becomes ice.
- Glaciers form on side of mountain peak (least sun/coldest winds) most accumulation/least ablation
- Arete = ridge between parallel valleys
- Pyramidal peak = 3 sided peak (3 corries form back to back)
- U-Shaped valleys = steep sided, flat bottom
- Formed from the erosion of V-Shaped valley
- Hanging valleys = tributary glaciers erode valley floor much less so glacier melts = valleys left at higher level
- Waterfalls come from this
- Truncated spurs = ridges of land stick out are chopped off
- Tarns = lakes in corries
- Roche moutonee = resitant (hard) rock mass on valley floor.
- Upstream (stoss) side = smooth
- Downstream (lee) side = rough
- Moraine : particular formationsof till
- Lateral moraine
- Deposited at glacier sides
- Medial moraine
- Centre of valley where two glaciers converge
- Two lateral moraines together
- Centre of valley where two glaciers converge
- Terminal moraine
- Builds up at end of glacier
- Lateral moraine
- Till = stuff glacier leaves behind - unsorted boulders, stones & clay
- Till plain = large expanse of till
- Formed when ice sheet melts
- Till forms drumlins
- Half egg shaped hills
- 1500m long, 100m high
- Upstream (stoss) = wide & tall
- Downstream (lee) = narrow & low
- Formation = till got stuck around rock or little hill sticking out into glacier
- OR Original mound gf dropped till got streamlined when ice readvanced
- Drumlins form in groups e.g. Ribble Valley, Lancashire
- OR Drumlins under water in Clew Bay, Ireland
- Erratics: Boulders picked up, carried long way dropped in different geology
- E.g. Silurian rocks on top of Carboniferous limestone, Yorkshire Dales
- Corries
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