Answer
Cavern formation stops at one level (depth) but continues or begins at a lower level due to changes in the water table. The water table represents the level below which the ground is saturated with water. As groundwater levels rise and fall over geological time scales, cavern formation can occur at different depths. When the water table drops, the dissolution process may halt at a particular depth, and new caverns may begin to form or continue forming at a lower depth where the water is still present.
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