Final answer:
Normal faults usually occur because of tension. In normal faults, the hanging wall moves down relative to the footwall. An example of a normal fault is the Basin and Range Province in the western United States.
Step-by-step explanation:
Normal faults usually occur because of tension. In normal faults, the hanging wall moves down relative to the footwall. Tensional stress causes the rocks to pull apart, creating a gap that is filled by the downward movement of the hanging wall. An example of a normal fault is the Basin and Range Province in the western United States, where the Earth's crust has undergone extensive extension.