Soil.....not dirt.
Dirt is unclean matter, especially when in contact with a person's clothes, skin or possessions. In such case they are said to become dirty. Common types of dirt include: Dust: a general powder of organic or mineral matter Filth: foul matter such as excrement Grime: a black, ingrained dust such as soot
Soil
, the biologically active, porous medium that has developed in the uppermost layer of Earth’s crust. It is one of the principal substrata of life on Earth, serving as a reservoir of water and nutrients, as a medium for the filtration and breakdown of wastes, and as a participant in the cycling of elements.