1. Changing Earth’s Surface
Section 9.1

2. Erosion Moving sediments from one place to another
5 major agents
all carry sediments using energy of motion
all drop sediments when energy of motion
decreases (deposition)

3. 1) Gravity- mass movements
Slump – occurs on steep slopes when
underlying material weakens
- moves as one large mass
- leaves a curved scar

4. 1) Gravity- mass movements
Creep – very slow movement of sediment
- caused by freezing and thawing

5. 1) Gravity- mass movements
Rockslides – large rocks break off of steep
slopes and tumble quickly to bottom
- occurs in mountainous areas
- most often after heavy rains

6. 1) Gravity- mass movements
Mudflows – heavy rains mix with sediment
and form a pasty substance
which moves downhill
- happens in relatively dry areas
video
video2

7. The end result in all mass movements is that there is a constant change to a less steep slope.