Soil: Literally And Symbolically The “Ground”

Soils are “living” systems—a combination of ground minerals and organic matter that began to form in the Cambrian Explosion (550 mya) after a mass extinction of life-forms between the Permian and Triassic geologic periods. Today, soils are to the land what plankton are to the oceans—the bottom or ground of the food chain. On average, […]