1. Erosion and Mass Movement
6 minutes

2. Erosion
The process by which the products of weathering are transported.
Ex. Wind, gravity, glaciers, ocean waves and currents, streams

3. Mass Movement
The movement of rock fragments down an incline as a result of gravity.
Talus: a pile of rocks that accumulate at the base of a slope.
There are four types of mass movements

4. Landslide
Sudden movement of loose rock and soil down a slope of a hill, mountain or cliff.
Caused by heavy rainfall, spring thaws, volcanic eruptions and earthquakes.
An avalanche is a type of landslide.
Landslide

6. Creep
Slow, downhill movement of rock and soil; it will cause fixed objects such as trees, fence posts, light poles in soil to lean downhill.
Usually goes unnoticed until objects begin to lean.
Caused by excess water in the soil, plant roots, burrowing animals, and alternating freezing/thawing.

7. Creep is an extremely slow process and often goes unnoticed.

9. Slumps are large blocks of ground that move in one piece.
Caused by excess water in the soil which causes a loss of friction allowing rock to slip downhill.

12. Mudflow Clay and silt saturated with water flow rapidly downhill.
Caused by heavy rain.
Usually occurs in dry, mountainous regions during sudden heavy rainfall.
Very dangerous….can wash out roads and destroy buildings.

13. Mudflows are movements of mud.
Cali 2017

14. Stabilization
In mountainous areas where mass movement is potentially possible steps are needed to prevent death and damage to property.
Methods include
Concrete retaining walls/ retaining bolts
Drainage pipes to reroute water
Grading the slope
Explosives

16. True or False
The process by which the products of weathering are transported is called erosion.
The movement of rock fragments down an incline as a result of an earthquake is mass movement.
Landslide is the sudden movement of loose rock and soil down a slope of a hill, mountain or cliff.
TRUCK