1. Wind, Ice, and Gravity Erosion

2. Wind Erosion
Wind is an agent of erosion when it moves soil, sand, and rock particles.
Wind erodes rock by:
abrasion
deflation

3. Types of Wind Erosion Abrasion: the grinding and wearing down of
rock surfaces by other rock material
Deflation: the removal of fine sediment by wind

4. Deflation

5. Landforms Caused by Wind
Dunes: mounds of wind deposited sands

6. Landforms Caused by Wind
Loess: thick deposits of windblown, fine-grained sediments
Fine grains blown far
and high.
Deposited far from source.
Builds up over
thousands of years.

7. Ice Erosion Glacier: large mass of moving ice that form from
the compacting of snow by natural forces
Glacial Drift: general term for all materials carried and deposited by glaciers

8. Types of Glaciers
Alpine Glacier: forms in a mountainous area, forms rough land features
Continental Glacier: thick sheet of ice that spread over large areas, form smooth land features

9. Landforms Caused by Alpine Glaciers
Cirque: bowl shaped depression at head of valley
Arete: sharp ridges forming between two cirques
Horn: when three or more aretes form a sharp peak

11. Landform Caused by Continental Glaciers
Moraine: sediments carried and deposited at the edge of the glacier
Esker: long ridge of sediment deposited from glacier

13. Glaciers http://www.brainpop.com/science/earthsystem/glaciers/

14. Glaciers in Minnesota

15. Gravity Erosion Mass Movement: shifting of materials due to gravity
Causes rock and soil to move downslope.

16. Slow Mass Movement
Creep: extremely slow movement of material downhill

17. Fast Mass Movement Rockfall: loose rock falls down a steep slope
Landslide: sudden and rapid movement of large amounts of material down a slope
Mudflow: rapid movement of large amount of mud