How does a sink hole occur?
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Basically water dissolves the structure under a particular area to the extent that the surface then collapses into the resulting cavity.
links: 1, 2 (pdf, check out 126–127), 3
graphics: 4, 5, 6
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We have quite a few here in Missouri, they’ve turned them into dumps, they’ve swallowed whole cars and houses, it’s crazy.
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