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Unformatted text preview: oxygen in the air to cause rust-like materials to form. (Water speeds up the process.) 2. Hydrolysis = water combines with chemicals in rock to change composition. (Red color of clay is caused by hydrolysis) 3. Acid rain can break down rock. 4. Some plant roots produce acids that chemical change rock. Mass Movement & Landforms Mass Movement – downhill movement of rocks and rock fragments due to the force of gravity. 1. Creep – saturated rock material moves slowly downhill. 2. Flow – saturated rock moves downhill at a noticeable rate. 3. Landslide – dry soil or rock moves down a steep slope. Talus 4. Subsidence – rock & material sinks to a lower level without sliding down a hill. Limestone dissolves in water; area collapses. Differential weathering = some rock layers weather faster than other & cause landforms like: Mesa Butte...
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- Fall '10