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I mean hitting your finger with the hammer is also a possibility.
How is this supposed to happen in nature? Does the water current ablate it enough? Get eaten and dissolved by a fish?
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See, it's a good question! I looked it up, but didn't find a firm answer. As far as I could figure, they:
- eventually freeze, crack open, and thaw
- get stepped on by a heavy animal (they are eaten by ducks & beavers)
- clunking around the bottom of a river/pond, letting the sand wear it down.
All conjecture, but I don't know!
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