A fault is a crack or fracture that forms from the stress of two moving blocks of land in the Earth’s crust. These fractures allow such blocks to move. The largest faults include the edges of the tectonic plates themselves, although other faults are much smaller. Faults are significant in geology as earthquakes; as blocks of land move a lot in areas with faults, rocks can break and release energy which causes the ground to shake. The main parts of a faulting diagram include a hanging wall or headwall, a footwall, a fault line and a fault plane. The hanging wall starts out as the upper block along a fault. The lower block is called a footwall. A fault line represents the fault itself. As the blocks of land move, they expose a new surface called a fault plane. Faults can be categorized depending on its angle and the direction to which it slips along the fault. In normal dip-slip faults, the hanging wall slides down while the footwall is raised upward. The reverse happens in thrust faults. On the other hand, a strike-slip fault has both blocks of land sliding past one another, moving much like how you’d rub both your palms together. You can examine this faulting diagram to help you learn more about the basic concepts in geology and better comprehend how earthquakes occur.