Modern Marvels: Salt Mines: Its our blood, sweat, and tears. Trace salt minings history--from the white gold on the table to the oceanic and underground deposits whence they came. Though today we take it for granted, most life depends on it. Roman soldiers were sometimes... (more details for Modern Marvels: Salt Mines)

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File by Melissa Usher (#3023)
2016-12-21 Grade: 9-10
File by D. Hoshaw (#3045)
2017-03-02 Grade: 9-10