Karst system. Cut-away artwork through a typical temperate karst landscape illustrating its subterranean features. Although resistant to physical weathering, karst rock, usually limestone or dolomite, can be dissolved by mildly acidic water. Dissolution by groundwater leads to the formation of subterranean cavities and conduits, large enough to be entered by people. These may be entered by holes above ground (top). These depressions, known as sinkholes are formed by the removal of bedrock by water.
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