| Term | Definition |
|---|
| Compressional stress | Differential stress that shortens a rock body. |
| Deformation | General term for the processes of folding, faulting, shearing, compression, or extension of rocks as the result of various natural forces. |
| Differential stress | Forces that are unequal in different direction. |
| Ductile deformation | A type of solid-state flow that produces a change in the size and shape of a rock body without fracturing. |
| Shear | Stress that causes two adjacent parts of a body to slide past one another. |
| Strain | An irreversible change in the shape and size of a rock body caused by stress. |
| Stress | The force per unit area acting on any surface within a solid. |
| Tensional stress | The type of stress that tends to pull a body apart. |
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