Chapter 26, Problem 10RAT

A fracture in a rock body is a fault if

(a) Stress exceeds the rock’s strength.

(b) One block of the rock body moves relative to the block on the other side of the fracture.

(c) The rock body crumbles.

(d) The footwall moves upward.

To determine

The correct option for the statement “A fracture in a rock body is a fault if”.

Answer to Problem 10RAT

The correct option for the statement “Rock buckle and fold when subjected to” is (b).

Explanation of Solution

If stress exceeds the rock’s strength, a fracture occurs in the rock. But of two blocks do not move relative to each other, such a fracture can not be called a fault. The crumbling of rocks does not involve the relative motion of two blocks, which is a necessary condition for the fracture to be called a fault. If the football moves upward, the fault is called a normal fault, which is one type of fault.

In case of brittle deformation, rocks may fracture into separate blocks. If these moves relative to each other, the fracture is called a fault, so the option (b) is the correct option.

Conclusion:

Therefore, the correct option for the statement “Rock buckle and fold when subjected to” is (b).