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I believe the author's was referring to phenomena like salt diapirs (where mobile salt deposits intrude into heavier overlying sediments). These produce low hills in the gulf coast region of the United States. The salt that is moving is not liquid, it is merely mobile. I do not believe the author of the book you reference was referring to sand and mud ...


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Molten rock must be a liquid, mobile rock is any rock capable of moving, sand and mud can be mobile.


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