A__ is brittle fracture in rocks, along which the rock bodies have moved relative each other.
strain?
slide?
fold?
fault?

The answer to filled in the blank in question out of the four given options is:

fault

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.

ahaha 8

my answer has to be at least 20 characters so here are the rest of the characters lol