Ok, I'm pretty good with science, but can anyone help me figure out how to explain what happens on a molecular level when something like glass or ice breaks in a simple way? A good website with simple pictures would be a plus.

Wolf knows about molecules and atoms and understands that water has two hydrogen atoms and one oxygen atom, but not a whole lot more than that. He would LOVE a full explanation of molecular physics, but that isn't going to happen right now, I just don't have the time or energy... That and it's just a bit mind numbing to me that he's 5 (!!!) and wanting to know all about this...