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Glaciers. I. Origin of Glaciers. Definition. I. Origin of Glaciers. Definition Originates on land. I. Origin of Glaciers. Definition Originates on land Forms from the accumulation, compaction, and recrystallization of snow. I. Origin of Glaciers. Definition Originates on land

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i origin of glaciers3
I. Origin of Glaciers
  • Definition
  • Originates on land
i origin of glaciers4
I. Origin of Glaciers
  • Definition
  • Originates on land
  • Forms from the accumulation, compaction, and recrystallization of snow
i origin of glaciers5
I. Origin of Glaciers
  • Definition
  • Originates on land
  • Forms from the accumulation, compaction, and recrystallization of snow
  • Survives year-to-year
i origin of glaciers6
I. Origin of Glaciers
  • Definition
  • Originates on land
  • Forms from the accumulation, compaction, and recrystallization of snow
  • Survives year-to-year
  • Moves under its own weight
i origin of glaciers7
I. Origin of Glaciers

B. Elevation required

i origin of glaciers8
I. Origin of Glaciers

B. Elevation required

sea level

18,000 ft.

10,000 ft.

sea level

i origin of glaciers9
I. Origin of Glaciers

C. Mechanism of Formation

slide10
Snow

C. Mechanism of Formation

Firn

Ice

Glacial Ice

i origin of glaciers11
I. Origin of Glaciers

D. Behavior of Flow

slide13
D. Behavior of Flow

2. Basal Sliding (Slip)

slide14
D. Behavior of Flow

2. Basal Sliding (Slip)

slide15
D. Behavior of Flow

3. Zone of Fracture (behaves as a brittle solid)

crevasses

slide16
D. Behavior of Flow

3. Zone of Fracture

ii types of glaciers
II. Types of Glaciers

A. Alpine Glaciers

ii types of glaciers18
II. Types of Glaciers

B. Continental Glaciers

iii glacial movement
III. Glacial Movement
  • Two distinctive zones on glaciers:
iii glacial movement20
III. Glacial Movement

Zone of accumulation

iii glacial movement21
III. Glacial Movement

Zone of ablation

iii glacial movement22
III. Glacial Movement
  • Accumulation vs. ablation determines movement
iii glacial movement23
III. Glacial Movement
  • Accumulation vs. ablation determines movement
iv glacial erosion
IV. Glacial Erosion

A. Processes for erosion

iv glacial erosion25
IV. Glacial Erosion

1) Plucking –

iv glacial erosion28
IV. Glacial Erosion

Glacial Striations

iv glacial erosion29
IV. Glacial Erosion

Glacial Polish

iv glacial erosion30
IV. Glacial Erosion

3) Bulldozing –

slide50
VI. Depositional Landforms

A) Moraines

  • Some of the varieties….
slide51
VI. Depositional Landforms

Lateral and Medial Moraines

A) Moraines

vi depositional landforms52
VI. Depositional Landforms

Lateral Moraine –

Lateral Moraine

vi depositional landforms53
VI. Depositional Landforms

D) Medial Moraine –

Medial Moraine

slide57
VI. Depositional Landforms

Ground and Terminal Moraines

A) Moraines

vi depositional landforms58
VI. Depositional Landforms

Terminal moraine –

vi depositional landforms66
VI. Depositional Landforms

E ) Outwash plain –

vii ice ages
VII. Ice Ages
  • Cause?
    • Milankovitch Cycles –
slide69
Eccentricity

Milankovitch Cycles –

Precession

(wobble)

Tilt

milankovitch cycles
Milankovitch Cycles

1) Eccentricity –

milankovitch cycles71
Milankovitch Cycles

2) Precession (wobble) –

milankovitch cycles72
Milankovitch Cycles
  • Obliquity

“tilt”–

vii ice ages73
VII.Ice Ages
  • Global cooling may produce glaciers
milankovitch cycles74
Milankovitch Cycles
  • Individual cycles vs. multiple cycles
slide76
400,000 years of change

Note how climate slowly cools going into a glacial period.

Then rapidly warms at the end. But quickly starts cooling again.

the pleistocene ice age
The Pleistocene Ice Age
  • Four major glacial advances over past 1.8 million years
  • Area covered?
  • Results?
the pleistocene ice age78
The Pleistocene Ice Age
  • Global sea level drop
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