Wells, A deep hole in the ground from which you can get water, oil , or gas, speleologist, someone who studies caves, or who climbs in them for sport, Burst, a sudden increase in something, especially for a short period, Vaulted, having a shape or structure with a curve at the top, like an arch of vault, Karst, The area of land formed of rock such as limestone that is worn away by water to make caves and other formations

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