Rock deformations usually include brittle deformation and ductile deformation.
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Strain is the change in shape of a rock caused by differential stress.
Tensional stress is the stress which pulls apart a rock unit and lengthens it.
Stress applied unequally in different directions is called differential stress.
The Hadean, the Archean, and the Proterozoic eons are commonly referred to as the Precambrian.