These e-courses introduce the European soil types according to the World Reference Base for soil resources. WRB is a two-level system of soil classification with 30 Soil Reference Groups and a series of uniquely defined qualifiers for specific soil characteristics.
For describing and defining soils the WRB exploits the following nomenclature:
- soil characteristics comprise single observable or measured parameters;
- soil properties are a combination of characteristics indicating soil-forming processes;
- soil horizons represent three-dimensional bodies containing one or more soil properties
SOIL ATLAS OF EUROPE, JRC, European Comission, 2005