Why is it that a rock that is brittle and breaks when we apply force to it

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Why is it that a rock that is brittle and breaks when we apply force to it with a laboratory machine can in nature behave as a plastic and bend into folds? Based on the graph in Figure 19.7, which part of the curve best describes isostasy? Faulting? Folding?

Figure 19.7

Applied stress rupture point B plastic limit A plastic deformation elastic limit Total deformation

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