Figure 9: Examples of Mollisols (grassland soils) formed from loess. Both soils have mean annual precipitation of 450 mm. The Ustoll (a) has an ustic soil moisture regime and the Xeroll (b) has a ...

Soils are home to more than 25 percent of the earth's total biodiversity, supporting life on land and water, nutrient cycling and retention, food production, pollution remediation and climate ...