GEOG 1350 Lecture Notes - Lecture 5: Thermokarst, Active Layer, Karst

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Week five geog 1350 earth: hazards and global change february 6th. Subsidence a slo(cid:449) or rapid, (cid:374)earl(cid:455) (cid:448)ertical do(cid:449)(cid:374)(cid:449)ard (cid:373)o(cid:448)e(cid:373)e(cid:374)t of earth"s surface. Karst result from dissolution and subsidence of near-surface rocks. Sinkholes large openings close to the surface, pits that develop alone or in large numbers. There are two basic types of sinkholes: solution sinkholes these pits form by solutions of buried bedrock. Acidic groundwater is concentrated in holes that develop along bedding planes, joints, and fractures: collapse sinkholes this type of sinkhole develops by the collapse of surface or near-surface rock or sediment into an underground cavern system. Cave systems beautiful rolling hills separated by lower areas underlain by cave systems. Tower karst large, steep limestone pillars that rise above the surrounding landscape. Disappearing streams karst regions underlain by a complex network of subterranean channels. Springs natural discharges of groundwater at the surface (large flows, especially in the rain)

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