We grew up around lots of canyons, and one in particular has small, shallow holes in the sides. When the family would drive through on a random Sunday drive, my father would tell us the holes were caused by "rock worms". He'd actually pull over so we could roll the window down and listen to them munching the rock - I couldn't ever hear anything, but I'd play along anyway. I didn't figure out they were actually caused by wind erosion until I was about 12.
A childhood belief about landscape

others believed things like this
- I thought Rock and Roll were 2 musicians, with one who rocked and one who rolled.Anon
- I used to think that the wind was caused by all the trees waving about.— dismal dunc
- My friends and I used to believe that if you planted a rock, it would grow a rock tree. Anon
- When I was a kid, I used to believe that windmills were what caused the wind to blow. silly me :)— Adrian Z. Ontario, CA USA
- I used to believe that the trees moving caused the wind to blow.— naomi
- When I was little, I used to believe that wind was caused by whales flapping their tails way out in the ocean.— Nanohawk