1) Dirt 2) Soil 
A Regosol in the FAO World Reference Base for Soil Resources is very weakly developed mineral soil in unconsolidated materials. Regosols are extensive in eroding lands, in particular in arid and semi-arid areas and in mountain regions. Internationally, Regosols correlate with soil taxa that are marked by incipient soil formation such as Entisols i...
one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Regosols are characterized by shallow, medium- ... [1 related articles]
[n] - a type of soil consisting of unconsolidated material from freshly deposited alluvium or sand
noun a type of soil consisting of unconsolidated material from freshly deposited alluvium or sand