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Write a short note on folding.
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In structural geology, a fold is a stack of originally planar surfaces, such as sedimentary strata, that are bent or curved during permanent deformation. Folds in rocks vary in size from microscopic crinkles to mountain-sized folds. They occur as single isolated folds or in periodic sets (known as fold trains).
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Fold, in geology, undulation in stratified rocks. Folds vary widely in size; some may be hundreds of kilometers across, whereas others measure just a
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