EARTHSC 2GI3 Study Guide - Final Guide: Landslide, Engine Knocking, Landfall
12 Apr 2017
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Subsidence- slow or rapid, nearly vertical, downward movement of earth"s surface; high calcium carbonate content. Not usually life threatening, one of the most widespread, costly natural hazards. Relatively slow, damages structures and infrastructure - a lot of preventative measures. Depressions collect water; fractures in the limestone allow water to run through cracks further dissolution creates more depressions and enhanced terrain, subterranean dissolution and caves. Karst- landscape resulting from the dissolution of limestone, dolostone, marble, gypsum or rock salt; associated with subsidence. Rocks are dissolved by surface water or groundwater; dissolution produces voids which join to form caves and sinkholes. Karst plain: a surface pockmarked with many sinkholes; prevalent in mexico. Tower karst: created in highly eroded karst regions; steep limestone pillars common in humid tropical regions. Soil expansion and contraction results from: changes in the water content of soil and freezing and thawing.
