Final answer:
A fault is a fracture through rocks that has experienced significant movement. The age of a fault is typically younger than the rock in which it is found because the fault forms after the formation of the rock. This movement can cause displacement and deformation of the rock layers, resulting in the creation of a fault.
Step-by-step explanation:
A fault is a fracture through rocks that has experienced significant movement. The age of a fault is typically younger than the rock in which it is found because the fault forms after the formation of the rock. Faults are created when stress causes the rocks to break along a specific plane, allowing for movement to occur. This movement can cause displacement and deformation of the rock layers, resulting in the creation of a fault.