To learn more about this topic, start your googling with these keywords:

• Karst: landscape underlain by limestone which has been eroded by dissolution, producing ridges, towers, fissures, sinkholes and other characteristic landforms.
• Solutional cave: a cave usually formed in a soluble rock like limestone
• Water table: the upper surface of the saturated zone underground, where all the pores and cracks in soil and rock are completely filled with water.

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