1. Erosion and Deposition
Ch. 7 Sec. 3
Erosion and Deposition

2. Erosion Transports materials from one place to another
Streams and rivers
Glaciers
Wind
Ocean Currents
When the erosion process slows down, materials dropped in another location: Deposition

3. Gravity’s Role Gravity pulls erosional agents down slope
Rivers need to flow
Landslides and glacial movement follow gravity

4. Erosion: Running Water
Greatest when large volumes of water is moving rapidly
Higher to lower elevations
Smaller streams flow to larger streams
System is known as a watershed

5. Erosion: Running Water
Rill Erosion
Running water in small channels on a side of a slope

6. Erosion: Running Water
Gully Erosion
Channels that becomes deep & wide
Can be more than 3 m deep
Major problem for farming and grazing areas

7. Coastal Deposition and Erosion
Each year, streams & rivers carry billions of metric tons of sediments to coastal areas
River flows into the ocean and water slows
Build up of the sediments known as Deltas

8. Coastal Deposition and Erosion
Ocean waves and tides erode the coastal areas
Dunes and beaches form as a result from the accumulating particles

9. Glacial Erosion Large scale and dramatic
So large they carry huge rock piles and debris over great distances
Many lakes and waterfalls are products of glacial movement

10. Wind Erosion Wind can easily transport fine, dry materials
Abrasive action of wind-blown particles can be damaging
Death Valley
Wind barriers can help reduce damage: trees