Salt is so important that it has been used as money and has supported the economies of many countries over the centuries. This book takes a fascinating look at- the composition of salt and how the body uses it- Ghandi's defiance of Britain's salt laws and salt's use by the first explorers- huge salt deposits in the Gulf of Mexico and salt glaciers in Iran- salt production, its different grades, and uses- rock salt mining, solution mining and brine evaporation, and solar salt production- pollution problems and alternatives to salt useChildren will be intrigued by this series that digs deep. Raw materials found under the earth have both a practical purpose, providing us with fuel, and a pleasing purpose, giving us dazzling jewels and metals to adorn ourselves. This fascinating series uses clear text, amazing photographs, and detailed diagrams to explain- how the material is formed- its use throughout history- where it is found in the world- how it is located and extracted- who is involved in its extraction- how the material is used- the potential problems for the environment and our health