Answer the following question given this paragraph: 

When plates are pushed or pulled, the rock is subjected to stress. Stress can cause a rock to change shape or to break. When a rock bends without breaking, it folds. When the rock breaks, it fractures. Mountain building and earthquakes are some of the responses rocks have to stress.


Q: Mountain building and earthquakes are some of the responses of rocks when subected to what?


A:
stress