Glacier Terms

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Glacier Terms
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Alpine vs. valley Glaciers

• Glacier A large mass of compacted snow and ice
  that moves under the force of gravity
• Alpine (Valley) Glaciers A glacier that moves
  within valley walls
• Continental glacier a glacier that covers a
  large part of a continent

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Glacial Polish

• Bedrock surface smoothed by the passage of a
  glacier

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Striations

• Parallel scratches on the surface of a rock
  caused by the movement of a glacier- aligned in
  the same direction as ice flow (ex. if the
  striation runs north to south, the glacier went
  from north to south)

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Drumlins

• Oval-shaped mound of unsorted glacial till- The
  round end of the hill faces the direction that
  the glacier came from

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MORAINE

• Irregular, hilly, unsorted deposit formed at the
  end of an advancing glacier when the melting ice
  front stays at the same position for a long time
  (ex. Long Island)

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Kettles/Kettle Lake

• Low spots in glacial deposits and places where
  large, buried ice blocks melt- leaves a hole
• Kettle Lakes are when the holes fill in with water

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Erratics

• A large boulder dropped by ice

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Esker

• A ridge made by water deposition within a tunnel
  under the ice

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Kame

• Deltas deposited by the water at the edge of a
  glacier

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In Notes Valley Shape

• Young riVers make V-shaped valleys
• Alpine glaciers make U-shaped valleys

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Visualizations

• Seasonal Migration of Snow
• Observe the retreat of ice sheets from North
  America.
• Observe how glaciers erode bedrock surfaces.

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Sorting(Your moment of Venn)
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Venn
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