English version

rock salt in Geology topic

From Longman Dictionary of Contemporary Englishrock saltˈrock salt noun [uncountable]  HEGa type of salt which is obtained from under the groundsea salt
Examples from the Corpus
rock saltThere were runs on bread, milk, firewood, rock salt and snow shovels.Improving rock salt distribution £350,000 saved by: Reducing number of suppliers from 75 to 11.Start doing weekly water changes of 10-20%, but don't add any more rock salt.Like eating two pounds of rock salt.