Why do rocks move?

Rocks happen to move if they are uncomforatable with the enviorment they are in at the current time, if a greater force is pushing on them when they are in there natural habitat they will grow uncomforitable this has lead to a masive disapearence in pet rocks. to solve this problem keep your pet rock on either a leash or near your lawn except if the event of a garden gnome where to happen remove the gnome at once garden gnomes have bean know to sacrafice rocks as an act of dominance. so if you have a pet rock and you are not sure if its safe or not leave a question.