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Mass Movement Changing Earth’s Surface

Review Weathering Weathering Erosion Erosion Soils Soils

Cycle of Erosion and Deposition What is a cycle? What are some cycles? What is a cycle? What are some cycles? Deposition – the agents of erosion deposit sediment Deposition – the agents of erosion deposit sediment –Sediment – material moved by erosion

Cycle of Erosion and Deposition The cycle that wears down and builds up Earth’s surface. The cycle that wears down and builds up Earth’s surface.

5 Agents of Erosion Gravity Gravity Running water Running water Glaciers Glaciers Waves Waves Winds Winds

Mass Movement One of several processes that move sediment downhill. One of several processes that move sediment downhill. Can be very fast or very slow Can be very fast or very slow Gravity!!! Gravity!!!

Mass Movement Landslide Landslide Mudflow Mudflow Slump Slump Creep Creep nStAMia0Q nStAMia0Q nStAMia0Q nStAMia0Q

Landslides Most destructive Most destructive Rock and soil slide quickly down a steep slope Rock and soil slide quickly down a steep slope

Mudflows Rapid downhill movement of a mixture of water, rock, and soil. Rapid downhill movement of a mixture of water, rock, and soil. Occur after heavy rains in a normally dry area. Occur after heavy rains in a normally dry area.

Slump Stand up straight, arms at your side Stand up straight, arms at your side Slump your shoulders Slump your shoulders What happened? What happened? A mass of rock and soil suddenly slips down a slope. A mass of rock and soil suddenly slips down a slope.

Slump This is different from a land slide This is different from a land slide The material moves down in a large mass. The material moves down in a large mass.

Creep You tell me!! You tell me!!

Creep The very slow downhill movement of rock and soil The very slow downhill movement of rock and soil Can occur on any slope Can occur on any slope

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