glaciers. i. origin of glaciers a.definition 1.originates on land
TRANSCRIPT
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Glaciers
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I. Origin of Glaciers
A. Definition
1. Originates on land
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I. Origin of Glaciers
A. Definition
1. Originates on land
2. Forms from the accumulation, compaction, and recrystallization of snow
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I. Origin of Glaciers
A. Definition
1. Originates on land
2. Forms from the accumulation, compaction, and recrystallization of snow
3. Survives year-to-year
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I. Origin of Glaciers
A. Definition
1. Originates on land
2. Forms from the accumulation, compaction, and recrystallization of snow
3. Survives year-to-year
4. Moves under its own weight
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I. Origin of Glaciers
B. Elevation required18,000 ft. sea levelsea level 10,000 ft.
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I. Origin of GlaciersC. Mechanism of Formation
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I. Origin of Glaciers
D. Behavior of Flow
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D. Behavior of Flow
1. Plastic Flow
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D. Behavior of Flow
2. Basal Sliding (Slip)
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D. Behavior of Flow
3. Zone of Fracture
crevasses
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D. Behavior of Flow
3. Zone of Fracture
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II. Types of Glaciers
A. Alpine Glaciers
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II. Types of Glaciers
B. Continental Glaciers
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III. Glacial Movement
Zone of accumulation
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III. Glacial Movement
Zone of ablation
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III. Glacial Movement
• Accumulation vs. ablation determines movement
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III. Glacial Movement
• Accumulation vs. ablation determines movement
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IV. Glacial Erosion
A. Processes for erosion
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IV. Glacial Erosion
Glacial Striations
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IV. Glacial Erosion
Glacial Polish
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IV. Glacial Erosion
3) Bulldozing –
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V. Erosional Landforms
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V. Erosional Landforms
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V. Erosional Landforms
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A) Cirques –
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A) Cirques……and Tarns
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V. Erosional Landforms
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2) Arete
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V. Erosional Landforms
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3) Horn –
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V. Erosional Landforms
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4) U-shaped valley
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V. Erosional Landforms
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5) Hanging valley
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5) Hanging valley
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V. Erosional Landforms
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6) Fjords –
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6) Fjords –
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VI. Depositional Landforms
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A) Moraines
VI. Depositional Landforms
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A) Moraines
VI. Depositional Landforms
Lateral and Medial Moraines
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VI. Depositional Landforms
Lateral Moraine –
Lateral Moraine
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VI. Depositional Landforms
D) Medial Moraine –
Medial Moraine
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A) Moraines
VI. Depositional LandformsGround and Terminal Moraines
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VI. Depositional Landforms
Terminal moraine –
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B) Drumlin –
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B) Drumlin –
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B) Drumlin –
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C) Kettles
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C) Kettles
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D) Eskers
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D) Eskers
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VI. Depositional Landforms
E ) Outwash plain –
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VII.Ice Ages
• Global cooling may produce glaciers
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The Pleistocene Ice Age
• Four major glacial advances over past 1.8 million years
• Area covered?• Results?
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The Pleistocene Ice Age
• Global sea level drop
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The Pleistocene Ice Age
• Land bridges