Strain is the change in shape of a rock caused by differential stress.
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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.
An unconformity is a break in the rock record during which deposition ceased, erosion removed previously formed rocks, and then deposition resumed.