Here's why:
* Solubility: Limestone is primarily composed of calcium carbonate, which is readily soluble in slightly acidic water. This solubility is crucial for the formation of karst features.
* Fracturing: Limestone often has a network of fractures and joints, which allows rainwater to penetrate and dissolve the rock.
* Chemical Reactions: As rainwater flows through the ground, it absorbs carbon dioxide from the air and soil, becoming slightly acidic. This acidic water reacts with the limestone, dissolving it and creating underground cavities.
While limestone is the most common rock type associated with karst landscapes, other soluble rocks like dolomite, gypsum, and halite can also form karst features.
