Question

Where are faults usually found and why do they form?

Answer 1

-Most of them happen around plate boundaries.
-The crust begins to break when the forces of the plate motion something like push or pull the crust so much. 

Answer 2

"Most faults occur along plate boundaries, where the forces of plate motion push or pull the crust so much that the crust breaks. There are three main types of faults: normal faults, reverse faults, and strike-slip faults." 
Not mine. But I wanted to help you. Hope this helps and take care.