Salt - Tears of the Earth

No creature can live without this magic mineral - and no living organism can produce it on its own. Amoebas, algae or humans - all life-forms are completely at the mercy of this simple chemical compound. In all bodies of water on earth, there is salt in abundance, and animals and humans have always been able to extract the valuable crystals from water - directly through their organs or with the aid of evaporation in salt lagoons.