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

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Presentation transcript:

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 Melting & Evaporation Exceeds Snowfall Melting Excess Made up by Ice Flowing in Terminus of Glacier Snowfall & Inflow = Melting & Evaporation (Ablation)

Anatomy of a Glacier

A Typical Glacial Advance and Retreat

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

If Accumulation Exceeds Ablation, the Glacier Advances

If Ablation Exceeds Accumulation, the Glacier Retreats

Eventually, Material Trapped in the Ice Reaches the Terminus

A Typical Glacial Advance and Retreat

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

Mountain Glacier Landforms

Continental Glacier Landforms

Greenland Ice Cap

Antarctic Ice Cap

Antarctic Subglacial Lakes

Lake Vostok

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