I was just scrolling and saw a video of a sink-hole forming and just swallowing a rather large area of water/grass. Like all of us I’ve seen photos of the gaping holes in cities etc.
But how do they work? Why do they form? Where did all the mass that was there before them go? Where does the stuff they swallow go? Mass can’t just disappear.
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What others have not yet mentioned, many sink holes results from illegal mining activities and detonations used, for them, to get to a particular layer below the surface
This might destabilize or expose some lower vulnerable layers to water tables, rains or running water bodies, ( cf, limestone caves at Carlsbad, resulting from dissolution of CaCO3 in water).Sometimes improperly filled mines , with sand, oil etc. also give away in terms of rains and floods, so the top layers collapses into the vacant space underground.
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