A Catalyst article about why human beings need salt (sodium chloride) in their diets to survive, but too much can be toxic. Where does salt come from, and what is it used for? This article looks at salt extraction and mining in England, the domestic and industrial uses of salt as well as its molecular structure.

This article is from Catalyst: GCSE Science Review 2007, Volume 17, Issue 3.

Catalyst is a science magazine for students aged 14-19 years. Annual subscriptions to print copies of the magazine can be purchased from Mindsets.

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