1. Erosion by : GRAVITY

2. Mass Movement Any type of erosion that happens as gravity moves materials downslope. Any type of erosion that happens as gravity moves materials downslope. The greater an object’s mass is, the greater its gravitational force is. The greater an object’s mass is, the greater its gravitational force is. Rocks and other materials are pulled toward the center of Earth by gravity. Rocks and other materials are pulled toward the center of Earth by gravity.

3. Slump Slump is… - when a mass of material slips down along a curved surface as one large mass. - when a mass of material slips down along a curved surface as one large mass.

4. Creep Creep is… - when sediments slowly shift their positions downhill. - when sediments slowly shift their positions downhill.

5. Rockfall Rockfall is… - when blocks of rock break loose from a steep slope and tumble through the air, crashing into other rocks. - when blocks of rock break loose from a steep slope and tumble through the air, crashing into other rocks.

6. Rock slide Rock slide is… - when layers of rock slip downslope suddenly. - when layers of rock slip downslope suddenly. - happen most often after heavy rains - happen most often after heavy rains

7. Mudflow Mudflow is… - a thick mixture of sediments and water flowing down a slope - a thick mixture of sediments and water flowing down a slope

8. Do you think buildings on steep slopes are safe places to live? Do you think buildings on steep slopes are safe places to live? Why or why not? Why or why not?