Chapter 17 Glacial and Periglacial Processes and Landforms

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Chapter 17Glacial and Periglacial Processes and
Landforms

• Geosystems 6e
• An Introduction to Physical Geography

Robert W. Christopherson Charles E. Thomsen
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Glacial and Periglacial Processes and Landforms

• Rivers of Ice  
• Glacial Processes  
• Glacial Landforms  
• Periglacial Landscapes  

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Rivers of Ice  

• Glacier a large mass of ice resting on land or
  floating as an ice shelf in the sea adjacent to
  land
• Not stationary
• Alpine glaciers a glacier in a mountain range
• Valley glacier
• Cirque glacier
• Peidmont glacier
• Tidal glacier
• Iceberg

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Rivers of Ice
Figure 17.1
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Rivers of Ice

• Continental glaciers large, continuous mass of
  ice ice sheet
• 81 Greenland
• 90 Antarctica

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Vatnajökull Ice Cap
Figure 17.5
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Glacial Processes  

• Formation of Glacial Ice  
• Compaction, recrystallization, and growth of snow
  and ice
• Glacial Mass Balance
• Accumulation
• Ablation
• Moraine  
•  Glacial Movement
• ice regelation to refreeze

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Mass Balance
Figure 17.7
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Glacial Polish
Figure 17.9
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Glacial Landforms

• Erosional and Depositional Landforms Created by
  Alpine Glaciation  
• Fjord
• Till
• Stratified drift
• Moraines
• Erosional and Depositional Landforms Created by
  Continental Glaciation  
• Outwash plain
• kettle

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Norwegian Fjord
Figure 17.12
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Periglacial Landscapes

• Periglacial describes frost weathering and
  freeze-thaw rock shattering
• Geography of Permafrost 
• 80 Alaska 
• Ground Ice and Frozen Ground Phenomena 
• Active layer 
• Humans and Periglacial Landscapes  

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Permafrost Distribution
Figure 17.18
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Permafrost Melting
Figure 17.24