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Glaciers

Glaciers. Glacier: a Flowing Stream of Ice. Mountain Continental (Greenland, Antarctica). Snowfall vs Melting & Evaporation (Ablation). Zone of Accumulation Snowfall Exceeds Melting & Evaporation Excess Snow Turns to Ice & Flows Out Zone of Melting or Ablation

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Glaciers

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  1. Glaciers

  2. Glacier: a Flowing Stream of Ice • Mountain • Continental (Greenland, Antarctica)

  3. Snowfall vs Melting & Evaporation (Ablation) Zone of Accumulation • Snowfall Exceeds Melting & Evaporation • Excess Snow Turns to Ice & Flows Out Zone of Melting or Ablation • Melting & Evaporation Exceeds Snowfall • Melting Excess Made up by Ice Flowing in Terminus of Glacier • Snowfall & Inflow = Melting & Evaporation (Ablation)

  4. Anatomy of a Glacier

  5. A Typical Glacial Advance and Retreat

  6. As long as Accumulation = Ablation, the Glacier Front Remains Fixed

  7. If Accumulation Exceeds Ablation, the Glacier Advances

  8. If Ablation Exceeds Accumulation, the Glacier Retreats

  9. Eventually, Material Trapped in the Ice Reaches the Terminus

  10. A Typical Glacial Advance and Retreat

  11. Abrasion Polish Striations Chatter Marks Crescentic Gouges Bedrock Scour Deposition Till Outwash Varved Clays Meltwater Erosion Results of Glaciation

  12. Mountain Glacier Landforms

  13. Continental Glacier Landforms

  14. Greenland Ice Cap

  15. Antarctic Ice Cap

  16. Antarctic Subglacial Lakes

  17. Lake Vostok

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