Geological salt formed millions of years ago when what is now land, lay under the sea. It is hard to believe that salt is now such a cheap (17) _____ , because centuries ago it was the commercial (18) ____ of today's oil. The men who mined salt became wealthy and, although the work was (19) _____ and frequently dangerous, a job in a salt mine was highly (20) _____ . Nowadays, the specific microclimates in disused mines have been (21) _____ for the treatment of respiratory illnesses such as asthma, and the silent, dark surroundings in a mine are considered agreeable in encouraging patients to relax.

MCQ: 21.4k CQ: 233

Practice

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