1. Chapter 3 Erosion & Deposition
Effects of Gravity on Erosion
3.4
Mrs. Teaman’s Erosion Example

2. QUESTIONS TO THINK ABOUT
Explain the difference between erosion and deposition.
What forces cause erosion?

3. Wearing Down & Building Up
Erosion: The process by which natural forces move weathered rock and soil form one place to another.
- Sediment
- Deposition
* Weathering, erosion, and deposition act together in a cycle that wears down and builds up the Earth’s surface.

4. Mass Movement
Gravity: The force that moves rock and other materials downhill.
- Landslides
- Mudslides
- Slump
- Creep

5. LANDSLIDES The most destructive kind of mass movement.
Occurs when rock and soil slide quickly down a steep slope.

6. MUDFLOWS
The rapid downhill movement of a mixture of water, rock, and soil.
Often occur after heavy rains in a normally dry area.

7. SLUMP A mass of rock and soil suddenly slips down a slope.
The material moves down in one large mass.
Often occurs when
water soaks the base
of a mass of soil rich
in clay.

8. CREEP Very slow downhill movement of rock and soil.
Often causes objects like trees to lean.
Often results from the
freezing and thawing of
water in cracked layers
of rock beneath the soil.

9. Questions 4 You!!!
Explain the difference between erosion and deposition.
What forces causes erosion?

10. Answers 4 You! Explain the difference between erosion and deposition.
- Erosion moves sediment from one place to another, while deposition lays down sediment in new locations.
What force causes erosion?
- The force of gravity and the forces exerted by running water, waves, and wind.

11. THE END!