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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.
^"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)