1. How does water erode the soil?
Rain uses gravity as a force to move soil.
Flash flooding and runoff of water causes erosion 1

2. Processes of Water Erosion
Sheet erosion -
Rills (tiny streams)
Gullies (trenches)
Transports sediments for deposits. 2

3. What is Mass Movement?
The transfer of rock and soil down-slope due to gravity 3

4. Triggers of Mass Movement
Water
Heavy rains and rapid melting of snow
Oversteepened Slopes
The steeper the slope the greater the chance for movement
Removal of vegetation
Roots keep the soil intact. Removing plants causes erosion
Earthquakes
Aftershocks dislodges rocks 4

5. Classification of Mass Movements
Rockfalls occurs when rocks or rocks fragments fall freely through the air.
Avalanches
extremely rapid movement of earth material or snow 5

6. The downward movement of a block of material along a curved surface.
Slides
A block of material moves suddenly along a flat, inclined surface.Slides that include segments of bedrock are called rockslides.
Slumps
The downward movement of a block of material along a curved surface. 6

7. Mudflows move quickly and carry a mixture of soil, rock, and water
contain a large amount of water.
Mudflows move quickly and carry a mixture of soil, rock, and water
Earthflows move relatively slowly and carry clay-rich sediment. 7

8. Creep is the slow, downhill movement of soil and regolith.8