| 21. | He also warned that rock salt is toxic to well water.
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| 22. | As the marshes evaporated, deep deposits of rock salt were formed.
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| 23. | Rock salt is located in the southwestern Urals and the southwest of Lake Baikal.
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| 24. | Fill a gallon bag with ice and add rock salt.
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| 25. | Khewra salt mine has estimated total of 220 million tones of rock salt deposits.
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| 26. | Other products shipped to Long Island via the NYA include bentonite and rock salt.
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| 27. | When buying rock salt, make sure the label says that is " edible ."
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| 28. | Freeze according to manufacturer's directions using 6 parts ice to 1 part rock salt.
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| 29. | They uncovered large deposits of potash and rock salt not far below the surface.
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| 30. | Rock salt extraction began at Winsford in the 17th century.
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