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Glaciers . Take-Away Points. Glaciers are flowing streams of ice Glaciers have a zone of accumulation where snowfall exceeds losses (ablation) Accumulation can be due to high altitude (mountain glaciers) or cold climate (continental glaciers)

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take away points
Take-Away Points
  • Glaciers are flowing streams of ice
  • Glaciers have a zone of accumulation where snowfall exceeds losses (ablation)
  • Accumulation can be due to high altitude (mountain glaciers) or cold climate (continental glaciers)
  • Glaciers have a zone of ablation where losses exceed snowfall
  • Glaciers are governed by a balance of snowfall, ice flow, and ablation
  • Glaciers retreat by melting back, not by retracting
  • Glaciers produce distinctive landforms and small scale features
glacier a flowing stream of ice
Glacier: a Flowing Stream of Ice
  • Mountain
  • Continental (Greenland, Antarctica)
snowfall vs melting evaporation ablation
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)
results of glaciation
Abrasion

Polish

Striations

Chatter Marks

Crescentic Gouges

Bedrock Scour

Deposition

Till

Outwash

Varved Clays

Meltwater Erosion

Results of Glaciation
take away points19
Take-Away Points
  • Glaciers are flowing streams of ice
  • Glaciers have a zone of accumulation where snowfall exceeds losses (ablation)
  • Accumulation can be due to high altitude (mountain glaciers) or cold climate (continental glaciers)
  • Glaciers have a zone of ablation where losses exceed snowfall
  • Glaciers are governed by a balance of snowfall, ice flow, and ablation
  • Glaciers retreat by melting back, not by retracting
  • Glaciers produce distinctive landforms and small scale features