Glacial Landscapes

Geography

 

 

 

Theories of climate change:

 

  •  Plate tectonics
  • Volcanic activity
  • Astronomical (eccentricity, obliquity, axial precession)

 

 

 

 

Human induced?

 

 

 

Changes in CO2 levels and other greenhouse gasses can lead to global warming

 

 

 

Zone of Accumulation

 

 

 

Snow gain > Snow loss

 

 

 

Zone of Ablation

 

 

 

glacier’s lower end or area of loss

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Firn

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Grannular compacted snow

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Erosion processes:

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  • Plucking (can cause rouche mountonee)
  • Abrasion (can create glacial polish)

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Continental glaciers

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Ice sheets over 3000m thick

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Degradational features:

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  • Polished and striated bedrock, lack of soil and regolith, scoured out depressions and valleys
  • Glacial lakes (5 Great Lakes)

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Aggradational features:

  • Glacial drift
  • Moraines
  • Drumlin
  • Kame
  • Kettle or kettle lake
  • Meltwater deposits
  • Outwash plain
  • Esker

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Alpine glaciers

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Glacier in a mountainous region

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D. features of alpine glaciers

  • Glacial valleys/trough
  • Hanging valley
  • Fjord
  • Cirque
  • Arete
  • Horn
  • Tarn

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A. features of alpine glaciers

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  • Lateral moraine
  • Medial moraine

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