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Chapter 17 Glacial 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 Glacial Mass Balance
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
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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
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Permafrost Melting Figure
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