Add Yahoo as a preferred source to see more of our stories on Google. Black salt in wooden bowl - Luis Echeverri Urrea/Getty Images Simply take a teaspoon of your colorful salt and dissolve it in a ...

Soils have a natural characteristic called the cation exchange capacity (CEC) that allows them to hold (and exchange) cations (e.g., Ca+2 or Na+). These cations are held tight enough on the CEC that ...

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...