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Mechanical properties of salt are important to the geologist because they determine the behavior of salt in large quantities. The ability of salt to flow or creep slowly under sufficient differential pressure is of particular importance in explaining the formation and shape of salt structures. The time-dependent strain or creep of salt and other non-metallic substances is not well understood, but available data show that, under suitable conditions of pressure, temperature, and environment, salt and other nonmetallic materials show a behavior similar to that of metals. Data concerning creep of salt obtained in the laboratory and in situ have been studied. From these data it is possible to derive, for the given conditions of stress, temperature, and environment, an equivalent viscosity for the salt. The values obtained show a variation of many orders of magnitude.

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