Here's why:
* Fault: A fracture in the Earth's crust where there has been movement.
* Hanging Wall: The block of rock that lies above the fault plane. It is so called because, in the context of mining, it often forms the "roof" of a mine shaft.
* Footwall: The block of rock that lies below the fault plane.
It's important to remember that the terms "hanging wall" and "footwall" describe the relative positions of the rock blocks, regardless of the fault's dip (angle of inclination).
