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.
In: 5
No, mass doesn’t disappear. Water flow underground washes the soil and stuff away, making a small hole underground grow larger until the ground above the hole can’t hole itself up any more and it collapses.
You can check out youtube for demonstrations. Small scale models of the ground with water flow and see how it causes a cavity in the ground to grow.
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