1. Erosion and Mass Movements

2. Erosion
Erosion causes the wearing away and lowering of Earth’s land and surface features as it transports material away
The sun fuels the water cycle and the forces of erosion

5. Mass Movements Triggers of Mass Movements
Mass Movement: The transfer of rock and soil downslope due to gravity
Factors that trigger mass movements:
Water-saturated Surface
Over-steepening of Slopes
Lack of Vegetation
Earthquakes .

6. Types of Mass Movements
 Mass movements are classified on the kind of material that moves, how it moves, and the speed of movement.
 Rockfalls/Debris Fall: When rocks or rock fragments fall freely through the air.

8. Types of Mass Movements
Debris Flow: In a debris flow, a block of material moves suddenly along a flat, inclined surface
• Speed: 1 mm/ day to 1 km/hr

11. Heavy Rains Can Trigger Slumps

12. Mass Movements Flows include: Avalanches Mudflows Landslides
Types of Mass Movements
Mass Movements
Flows include:
Avalanches
Mudflows
Landslides
•Mudflows

14. Mass Movements Types of Mass Movements
Creep: the slow, downhill movement of soil
Soil Creep moves more material per year than any other mass movement- even though it is slow, it is constantly happening
*Creep can cause: Cracked roads, leaning utility poles, and bent trees