GPHY 102 Lecture 17: Rock Structures, Weathering and Mass Wasting
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Type of debris is determined by rock type and structure of these joints. Frost wedging: freeze-thaw action of water: water expands ~10% when frozen, expanding wedge of ice exerts pressure and splits rock, repetition is key in the process. Influential variables: rock type, climate, chemical weathering dominates in warm, humid climates, physical weathering dominates in cold environments. Mass wasting/movement: downslope movement of earth materials under the influence of gravity, affected by slope angle, material, water content, orientation of strata, vegetation, classified according to type of movement material and speed. 5: type of movement, creep is gradual but persistent movement od dry surface material. Falls occur with the rapid movement of materials vertically. Slides occur when consolidated layers of rock, soil or sediment slide down slope in discrete blocks. Flows involve movement of rock fragments, soil, or sediment in a fluid fashion: type of material, consolidated materials (e. g. rock layers, large boulders, unconsolidated materials (e. g. soil.
