“A nation that destroys its soil destroys itself.”
Franklin D. Roosevelt knew what he was talking about when he wrote that excerpt in a letter to all State Governors regarding a Uniform Soil Conservation Law in 1937. Soils provide anchorage for plant roots, hold water long enough for plants to use it, and store nutrients that sustain life. Even though soil color differs throughout the nation, it’s still one of the world’s biggest natural filters. Soils remove contaminants through their chemical, biological, and physical properties. In other words, soils are the kidneys of all earth ecosystems. The picture below (by the NRCS) shows all the various soils in the United States.