because of the ductile behavior of rock
Normals faults are caused by tensile stress within the Earth's crust.
A normal fault is a fault in which the hanging wall has moved downward relative to the footwall.
In a normal fault, the fault is at an angle, so one block of rock lies above the fault while the other lies below it. The rock above it is the hanging wall and the rock below it is the footwall. In a...
Normal refers to that the angle of the fault is 90o