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What's the geology like in Zunyi?
Karst landform is the result of long-term dissolution of groundwater in limestone area. The main component of limestone is calcium carbonate (CaCO3), which reacts with carbon dioxide in the presence of water to produce calcium bicarbonate [Ca(HCO3)2], calcium carbonate+carbon dioxide+water → calcium bicarbonate -CaCO3+CO2+H2O = Ca (HCO3) 2. The latter is soluble in water, thus forming a cavity and gradually expanding. This phenomenon is most typical in the karst plateau along the Adriatic Sea in southern Europe, so this terrain in limestone area is often called karst terrain.
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