Which one of the following statements regarding rock deformation and strength is correct?
A) Rupture and plastic deformation occur when stresses and strain rates exceed the elastic limit of a material.
B) Elastic deformation is accomplished through internal flow of material.
C) Rocks undergo plastic deformation less readily as temperatures and pressures increase.
D) When rocks are subjected to stress for long time spans, very small, plastic deformations accumulate to produce large, permanent, elastic deformations.

Question

Quizplus · Accepted Answer

Rupture and plastic deformation occur when the stress applied to a rock exceeds its elastic limit. Beyond this point, the rock will not return to its original shape when the stress is removed, leading to permanent deformation or rupture. Elastic deformation, on the other hand, is reversible and does not involve internal flow of material. Rocks actually become more prone to plastic deformation with increased temperatures and pressures, contrary to what is suggested in option C. Lastly, plastic deformations are permanent and do not accumulate to produce elastic deformations, as elastic deformations are by definition reversible.

Which One of the Following Statements Regarding Rock Deformation and Strength