Sinkholes can open overnight when limestone cave roofs collapse
A sinkhole can appear almost overnight when the roof of a buried limestone cave thins until it fails, dropping soil, roads, or buildings into a sudden pit.
Groundwater dissolution, heavy rains, drought, and human pumping can all weaken the span. Some collapses are meters across; others swallow city blocks in dramatic failures.
Stable ground can be an illusion over hollow rock. Sinkholes warn that karst landscapes keep editing the surface from below without asking permission.
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