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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Define Geomorphology |
The scientific study of landforms - considers topographic change throughout time as a response to erosional and depositional processes |
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Two approaches: |
Evolutionary approach (Davis and Penck) and Functional Approach (Gilbert and ...) |
Two approaches and 3 important people |
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The four stages of an evolutionary approach land development model |
Impulsive uplift Youth Maturity Old Age |
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Describe youth phase (Davis) |
Incision into the landscape by a river system resulting in valleys with steep relief |
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Define Maturity Phase (davis) |
Slopes begin to erode back and broad valley shapes emerge - rivers lose their importance at this stage and creep processes begin to dominate as a result of the slowing down of processes overall |
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Define Old Age phase (Davis) |
Refers to the period in which elevation and relief are both low - Davis refers to this as a peneplain, and following his model the whole world should be a peneplain (too simplistic) |
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Main controls on a Peneplain and how they affect it? |
Climate - controls the rate of active ersosional processes Lithology - determines the resistance level to erosional processes of the landscape |
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Define Impulsive Uplift Phase (Davis) |
Form of the surface is directly related to its internal arrangement/structure and the height controlled by the amout of uplit taking place |
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Davis' Destructive Processes |
Chemical action of air and water such as acid rain Mechanical action of wind, heat and cold from a variety of sources such as rain, snow, glaciers, waves, currents, and rivers Earth surface is mostly affected by changes in weather and lotic waters |
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Davis' belief on limits to change |
Limited by altitude above sea level as normal destructive mechanisms cannot erode land below the base level of their own action. Also glacial or moraine forces cannot erode sea level indefinitley |
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