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The Glaciers Quiz #3

How are some of the glacial landforms formed? 10 Questions.

 
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1
Question 1 Photo

How is a crevasse formed? A crevasse is a deep crack or fracture found in an ice sheet or a glacier.

  • When parts of a glacier can't move at the same speed - this causes the built up of stress fracturing the ice.
  • Melt water erodes the top part of the glacier. allowing for basal sliding
  • The PMP of the glacier causes abrupt pressure outbursts in the glacier.
  • A crevasse is formed when ice crystals do not pluck the landscape.

2
Question 2 Photo

How are lateral moraines formed? Lateral moraines are parallel ridges of debris located on both sides of the glacier.

  • Disrupted formation of eskers.
  • Frost shattering causes debris to deposit on the sides of the glacier.
  • Pre-glacial rivers deposited boulders on the point bar.
  • The river scar of a former river traps debris on the side of the glacier.

3
Question 3 Photo

How are drumlins formed? These are elongated hills of glacial deposits.

  • Debris deposited by a low velocity upper course river.
  • Debris which has been moved along by erratics.
  • Debris accumulated by avalanches.
  • Debris accumulated on the base of the glacier.

4
Question 4 Photo

How are kettle lakes formed? Kettle lakes are shallow, sediment-filled bodies of water.

  • Retreating glaciers trapping ice calving in sediment outwash plain.
  • Heavy rainfall accumulating in synclines.
  • Ice calving from the retreating glacier's Zone of Ablation.
  • Snowfall and firn melting in the summer season.

5
Question 5 Photo

How are cirque basins formed? This landform is also known as a ''corrie'' (from Scottish Gaelic ''coire'') meaning ''cauldron''.

  • Esker build up traps firn build up, causing its melting in the summer months.
  • Deposition of lateral moraines.
  • Resulting tarn (lake) formation from melting glacier.
  • Expansion of the outwash basin due to the retreating glacier's terminus.

6
Question 6 Photo

How is an esker landform formed? These are long and narrow ridges, which mark the former location of a glacial tunnel.

  • Built up of a delta from the floor of the lake.
  • Deposition of erratics due to avalanches.
  • Built up of material underneath the glacier.
  • Meltwater descending from the ice and onto the surface of the glacier.

7
Question 7 Photo

How is an arete formed? This is a thin ridge of rock which separates two valley sides.

  • Retreating glacier leaves behind ice calving forming the arete.
  • Glaciers forming parallel ''U-shaped valleys'' with cirque basins.
  • Pre-glacial rivers deposited boulders on the point bar.
  • Melt water erodes the top part of the glacier. allowing for basal sliding and the arete.

8
Question 8 Photo

How is a kame formed? A kame is an irregularly shaped hill or mound composed of sand, gravel and till.

  • Accumulation of a moraine in a depression on a retreating glacier.
  • Disrupted formation of eskers.
  • Frost shattering causes debris to deposit on the sides of the glacier.
  • Resulting tarn (lake) formation from melting glacier.

9
Question 9 Photo

How are terminal moraines formed? A moraine is material which has been plucked from underlying rock.

  • Deposition of lateral moraines.
  • The PMP of the glacier causes abrupt pressure outbursts in the glacier.
  • Pre-glacial rivers deposited boulders on the point bar.
  • Ice melts and deposits all the moraine it was transporting at the front of the glacier.

10
Question 10 Photo

How is an outwash plain formed? An outwash plain is a plain formed of glacial sediments.

  • Deposition of meltwater outwash at the terminus of a glacier.
  • Esker build up traps firn build up, causing its melting in the summer months.
  • Ice calving from the retreating glacier's Zone of Ablation.
  • Accumulation of a moraine in a depression on a retreating glacier.

 

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