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A sinkhole, also known as a cenote, sink, sink-hole, swallet, swallow hole, or doline, is a depression or hole in the ground caused by some form of collapse of the surface layer. Most are caused by karst processes – for example, the …
Sinkholes near the
, formed when underground salt is dissolved by freshwater intrusion, due to continuing sea-level drop.
Collapse sinkhole in
, near Madrid, central Spain.
Collapse formed by rainwater leaking through pavement and carrying soil into a ruptured sewer pipe.