Final answer:
Normal faults are faults that occur during the extension of the Earth's crust. They are characterized by a steep fault plane and a horizontal movement of the hanging wall. Sometimes, these faults can flatten out to a nearly horizontal position deep in the Earth.
Step-by-step explanation:
Normal faults are faults that result from the extension of the Earth's crust. These faults occur when one block of crust moves down relative to the other block.
They are characterized by a steep fault plane and a horizontal movement of the hanging wall. In some cases, normal faults can flatten out to about horizontal deep in the Earth.
For example, in the case of the Moab Fault Zone, which is mentioned in the provided information, normal faults can be observed. These faults are shown in Figure 9, where they are characterized by a horizontal displacement.
In summary, normal faults are faults that occur during the extension of the Earth's crust. They are characterized by a steep fault plane and a horizontal movement of the hanging wall. Sometimes, these faults can flatten out to a nearly horizontal position deep in the Earth.