GEOG 1010 Lecture Notes - Lecture 9: Regolith, Viscosity
18 Apr 2019
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"debris" is coarse-grained; 20-80 percent > 2 mm in size. "earth" is fine-grained; 80 percent or more are <2 mm in size. Free fall - material detaches from a slope and then free falls through the air, or bounces and rolls downslope. Slide - material (either rock or regolith) that slides along a surface of rupture. Flow - continuous movement of rock, regolith, or both that behaves as a high- viscosity liquid. Three factors make up the criteria for the classification scheme or mass movements: Nature of the mixture of solids (rock, debris, or earth materials) Creep is low and only detected by dislocation or bending of features at the surface, whereas debris avalanches are very rapid flows or rock, regolith, vegetation, and/ or sometimes ice. m. Talus slopes - the loose material that piles up at the base of steep slopes is called talus. The lack of vegetation of soil on talus indicates that material is actively accumlating.
