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Stress applied unequally in different directions is called differential stress.

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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.

Most layers of sediment are deposited in a horizontal position.

The Mesozoic era is the age of "middle life" on Earth

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