The "material that forms at the interface of the atmosphere and the lithosphere which is capable of supporting plant growth" (White 1997).
A critically important component of the earth's biosphere maintaining local, regional, and world-wide environmental quality (Doran & Parkin, 1994).
The "different forms of earth on the surface of the rocks, formed by the breaking down or weathering of rocks."
A "natural body composed of solids (minerals and organic matter), liquid, and gases that occurs on the land surface, occupies space, and is characterized by one or both of the following: horizons, or layers, that are distinguishable from the initial material as a result of additions, losses, transfers, and transformations of energy and matter or the ability to support rooted plants in a natural environment."
The granular material on the surface of other celestial bodies. Lunar soil and Martian soil are terms in general use that fit within the context of this project.
July 2008 - The C-Class was added to the assessment scale, prompting a flurry of article improvement and reassessment, but also lengthening bot article assessment cycle from days to weeks.
May 2008 - Another public domain soil profile photograph, Image:Narragansett_silt_loam_URI.png, is deleted as unsourced.
April 2008 - Two public domain soil profile photographs, uploaded by briefly active User:Jimjet, deleted as unsourced. Jimjet did not specify that he took the photographs as an employee of USDA, and he did not respond to dispute their removal. Deleted photos were of George Demas (Image:GeorgeDemas.png), and a Paxton (soil) profile (Image:Paxton Soil.jpg).
^"White RE (1997)". Principles and practice of soil science: the soil as a natural resource,4th ed. Blackwell Publishing. 1997.
^ Doran, J.W., & Parkin, T.B. (1994) Defining and assessing soil quality. In Defining soil quality for a sustainable environment (SSSA Special publication No 35). Soil Science Society of America, Madison
^"Soils". The New Student's Reference Work. F. E. Compton and Company. 1914. Retrieved 2007-12-17.
^Soil Survey Staff (1999). "Chapter 1: The Soils That We Classify"(pdf). Soil Taxonomy, A Basic System of Soil Classification for Making and Interpreting Soil Surveys (2nd edition). United States Department of Agriculture - Natural Resources Conservation Service. pp. Page 9. Retrieved 2007-12-17. (Agricultural Handbook 486)