Facts worth knowing about salt Salt is a multi-faceted commodity. Schools and people with a general interest look at salt from many different standpoints. You’ll find everything that’s worth knowing about salt here, and all the information is arranged clearly for you. ORIGINS AND DEPOSITS How does salt originate, and where is it found? This section deals with basic questions about the geological and mineralogical aspects of salt, together with information about its chemical and physical properties. EXTRACTING SALT Underground or surface extraction? Get to know the different types of salt – evaporated salt, sea salt and rock salt – and the methods used to extract each of them. FUNCTIONS AND USES All living organisms, be they humans, plants or animals, are dependent on salt. But why is that so?