Erosional ForcesGravity

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Gravity Erosion• Gravity is the force that moves rock and other materials downhill.

• Gravity causes mass movement.– Mass movement: any process that causes sediment to move downhill.

Different Types of Mass Movement

• 1) Landslide– Most destructive. Occurs when rock and soil quickly slide down a steep slope.

• 2) Mudslides– Mixture of water, rock, soil that moves downhill mostly after heavy rainfall.

• 3) Slump– Mass of rock suddenly slips down a slope. This occurs mostly when water

erodes away the bottom of a hill.

• 4) Creep– Very slow downhill movement of rock and soil. Occurs when water freezes and

thaws in cracks in the rock underground.