Audio tour of the World Soil Museum. ln this part of the audio guide we look at soils that have been deeply influenced by man. Household refuge and waste is often deposited on or in the soil. In the past household refuge was often used to fertilize agricultural land. The black soil from the Amazon created under the management by pre-Columbian Indian populations, a city soil and a soil from a peat dike are included in this part of the exhibition and the audio tour.