Solids in and of themselves do move slightly, but "wriggling" is not really a form of movement one would expect to see at the molecular level.
You can wriggle rubber. And it will still have same size and shape.
To wriggle is a verb and a wriggle is a noun.
Well, it is a verb and a noun because there is two definition for wriggle.
"Move move" or "wriggle wriggle"
I picked up the angry puppy as he tried to wriggle free.
Wriggle, wiggle, fidget, twist, worm, writhe...
The worm would not wriggle while the bird was there, but later it was able to move safely. He started to wriggle and later he managed to get himself freed from the ropes.
still
Euclid was the one who proved that there are only five platonic solids.
wriggle
It is wriggle!
move