When rock layers break and slide on a surface, the resulting feature is called a fault.

Here's a breakdown:

* Fault: A fracture in the Earth's crust where there has been movement.

* Fault Plane: The surface along which the movement occurs.

* Hanging Wall: The rock block above the fault plane.

* Footwall: The rock block below the fault plane.

Faults are a common geological feature, and they can range in size from microscopic to hundreds of kilometers long. The movement along faults can cause earthquakes, and they play a major role in shaping the Earth's surface.