Answer:
The answer to filled in the blank in question out of the four given options is:
fault
Step-by-step explanation:
A fault can be defined as a zone of fractures or a brittle fracture where two blocks of rocks move relative to one another.
It is when relative displacement of rocks occur as a result of tensile and compressive forces acting opposite to the fracture sides.
The fault is further divided into three types as mentioned: Strike - slip faults, normal faults and reverse faults.