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WEATHERING: breaking down of rock material by physical or chemical means. EROSION: the transport of weathered materials. DEPOSITION: the putting down or emplacement of eroded material. 2 types of weathering… PHYSICAL WEATHERING= the mechanical breakdown of material (smaller pieces, same composition) CHEMICAL WEATHERING= the breakdown of material resulting from a change in chemical composition. (new materials, “separated” from whole) Examples of physical weathering… ABRASION: the breakdown of material due to frictional contact with another substance (sand blasting, water). FROST ACTION: water gets into the cracks in rock, freezes and expands, widening the cracks or breaking off pieces. EXFOLIATION: repeated heating/cooling of the rock due to sun, creates cracks. Examples of chemical weathering OXIDATION: chemical reaction associated with the presence of water and oxygen, results in weaker material. ACID: chemical reaction with natural acids and materials results in DISSOLUTION. BIOTIC ACTIVITY: plants,etc., create chemical conditions for breaking down materials. Factors affecting rates of weathering: Location and surface:volume Agents of Erosion GRAVITY: also called mass wasting (slump, rock slides, mudflows, creep) GLACIERS: glacial actions include plucking, transporting, and scoouring WIND: to reduce wind erosion methods include windbreaks and root systems. WATER: 2 types: Stream and Sheet erosion; largest agent of erosion