

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!



































I feel like that’s probably a badge of honor.