Strain, the amount of deformation undergone by an object, is expressed in rocks by

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Strain is expressed in rocks through the processes of folding or faulting, which involve the deformation of rock layers. Metamorphism is a process by which rocks are altered due to heat and pressure, but it does not necessarily involve deformation. Breaking and removal, as well as bending, are not necessarily indicative of strain in a rock, as they can occur for a variety of reasons unrelated to deformation.

Strain, the Amount of Deformation Undergone by an Object, Is