1. The water table should be below the surface to allow formation of the features.
2. The climate should be hot and humid to facilitate chemical reaction.
3. The rock should be hard and well jointed to allow to allow water to percolate through the lines of weakness
4. The surface rock must be thick lime water to allow solubility by rainwater
alvinellavu answered the question on March 5, 2019 at 17:58
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