Glaciers

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Slides on Glaciers, made by a colleague for open sharing. Formation, types of Glaciers, effects and examples of glaciated landscape

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Glaciers

  1. 1. 5th Year Geography
  2. 2. LC Question (2011 HL)  Name one landform on the Ordnance Survey map that was formed by fluvial or glacial or coastal processes and give a six figure grid reference for its location.  Describe and explain with the aid of diagram(s) the processes involved in the formation of this landform. Marking Scheme  Named landform 2 marks  Six figure grid reference 2 marks  Process named 2 marks  Labelled diagram 4 marks graded  Explanation 10 x SRPs  Give credit for extra labelling in diagram(s) from explanation  Feature or process can be starting point  Max 2 SRPs if description only of landform.
  3. 3. Glaciation http://www.youtube.com/watch?v=AG3luuhc-5Y&feature=related http://www.youtube.com/watch?v=XOGbOOaPHsw&NR=1
  4. 4. Glaciation Glacials (col;d)and Interglacials
  5. 5. Glacial Movement  Basal flow – weight of ice causes layer closest to ground to melt – same process used by ice skaters – meltwater acts as a lubricant
  6. 6. Plastic Flow & Rotational Slip  Plastic flow – Ice melts around a specific object (like a large boulder) and the Glacier flows around it  Rotational slip – ice “rotates” around a central point – like a child on a swing. Can also be seen in mass movements (e.g. Landslides)
  7. 7. Glacier types  Cirque or Corrie Glacier – a build up of ice high up in a hollow (corrie) in the mountains.  Valley Glacier – when the ice build up in the corrie is too great, the ice spills out and flows downhill as a valley glacier  Piedmont Glacier – when two or more Valley Glaciers meet  P138  http://www.gearthhacks.com/streetview/file.php?fileid=9065
  8. 8. Glacial Processes Erosion Transportation Deposition
  9. 9. Glacial Erosion Page 140  Plucking Animation: http://www.homepage.montana.edu/~geol445/hyperglac/eroproc1/animated~plucking.gif  Abrasion: Polishing and Striations (striae)
  10. 10. Glacial Transport  Moraines Page 140
  11. 11. Glacial Deposition Page 141
  12. 12. Glacial Landforms
  13. 13. Cirques (Corries) and Tarns P.142 Upper and Lower Lough Bray, Co. Wicklow Devil’s Punchbowl, Co. Kerry
  14. 14. Arêtes & Pyramidal Peaks P.142  The Matterhorn, Switzerland  Arête: Between Upper and Lower Lough Bray, Co. Wicklow
  15. 15. Glaciated Valleys (U-shaped valley), Ribbon Lakes P.144  Glendalough, Co. Wicklow.  Ribbon Lakes: Glencar, Co. Sligo.
  16. 16. Truncated Spurs  Glencree, Co. Wicklow
  17. 17. Hanging Valleys P.145  Glendalough, Co. Wicklow.
  18. 18. Fiords P.145  Killary Harbour, County Mayo/Galway
  19. 19. Geirangerfjord, Norway Steep Valley Sides Deep base – Grirangerfjord is more than 600 metres deep – 5 dublin spires could fit into it
  20. 20. Summarising…. Features of Glacial Erosion Cirque/Corrie Arête Pyramidal Peak U-shaped Valley Ribbon Lake Truncated Spurs Hanging Valleys Fiords
  21. 21. Glacial Deposition Page 141
  22. 22. Glacial Deposits and Fluvioglacial Deposits First let’s do the Glacial Deposits  Boulder Clay Page 146  Moraine Page 147  Drumlin Page 148  Erratic Page 149
  23. 23. Fluvioglacial Deposits  Outwash Plains, The Curragh  Eskers Esker Riada, Clonmacnoise, Co. Offaly
  24. 24. The glaciation of Ireland P.151 2 of Europe’s 4 Major Ice Ages Reached Ireland  175,000 – 100,000 Years ago: Munsterian Ice Age  70,000 – 10,000 Years ago: Midlandian Ice Age
  25. 25. Glaciated Ireland  The ice sheets that spread over Ireland had the effect of “freezing up” the seawater – as a result water levels dropped.  This resulted in Ireland, Britain and Europe joined together as one large landmass  When the ice sheets melted two things happened  The Sea level rose  The land rose (as it was not being “pushed down” by ice any more)  This resulted in a unique landscape
  26. 26. Glaciated Ireland – sea levels
  27. 27. Midlandian Glaciation from Space

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