how does this prove anythiing? once again the rock is only being covered! therefore no damage is beeing done to the rock... its just getting raped by a tree.
Dude even from the picture, you can see how the bigger roots are leaving an indention in the rocks surface. It's basic science, Time plus pressure plus friction. It's not kryptonite, it's just a rock, and eventually if the tree survives, and grows enough, the rock will be broken.