1. Erosion and Deposition by Mass Movement
10.4
Erosion and Deposition by Mass Movement

2. Describe places where the warning sign “Watch for falling rocks!”
would be necessary or useful.

3. Mass Movement
The movement of any material, such as rock, soil, or snow, downslope.

4. Angle of Repose
The steepest angle, or slope, at which loose material no longer moves downslope.

5. Rapid Mass Movement Slump Most common landslide
Landslide – the sudden rapid movement of a large amount of material downslope.
Slump
Most common landslide
Occur when a block of material moves downslope over a curved surface.

6. Rapid Mass Movement
Rock fall – loose rocks fall down a steep slope.

7. How can a landslide affect wildlife habitats?
A landslide can change a human or wildlife habitat by carrying away plants and animals or by burying a habitat.

8. Rapid Mass Movement Mudflow – mass movement of a large mass of mud.
Happens when a large amount of water mixes with soil and rock.

9. Mass Movement Creep – Extremely slow movement of material downslope.
Water loosens soil, plant roots act as wedges that force rocks and soil apart, burrowing animals loosen rock and soil particles.

10. Landslides
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11. Why must city planners determine the risk of mass movement when deciding how to use land?
It is not advisable to build near a known hazard. The frequency and severity of mass movement would need to be considered when making this decision.

12. Review Questions What is mass movement?
Mass movement is the movement of any material downslope.
2. How do mass movements affect humans?
Mass movements affect humans by affecting the habitats in which humans live. Mass movements can destroy houses and roads.

13. Which types of mass movement are most dangerous to humans?
Rapid mass movements, such as rock falls, landslides, and mudflows are the most dangerous types of mass movements for humans because large amounts of material move rapidly downslope without warning.
Creep is a type of mass movement that occurs slowly. Describe the kinds of effects that you think creep has on trees, buildings, and roads.
Creep slowly changes trees, buildings, and roads. The trunks of trees may appear to bend as they grow. Buildings may become unstable or their foundations may crack. Roads may crack as a result of creep.

14. Review Quiz 10.4 Mass movement Rock fall Mudflow Landslide Creep
Angle of repose
Slump
gravity

15. Chapter 10 test Mass movement energy Rock fall barrier spit
Mudflow continental glacier
Landslide alpine glacier
Creep surf
Angle of repose beach
Slump dunes
Gravity desert pavement
Glacier deflation
Saltation abrasion
Stratified drift sea caves
Sea stacks sea arches
Sea cliffs