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Hypothesis: If the permeability of different soil types are tested then sand will be the most permeable, and clay the least permeable. Variables: Independent Variable: Type of soil Dependent Variable: Permeability Control Variable: amount of moisture added, amount of soil, temperature Experimental Set-Up:
Soil particles can be classified by their chemical composition (mineralogy) as well as their size. The particle size distribution of a soil, its texture, determines many of the properties of that soil, but the mineralogy of those particles can strongly modify those properties.he mineral material from which a soil forms is called parent material. Rock, whether its origin is igneous, sedimentary, or metamorphic, is the source of all soil mineral materials and the origin of all plant nutrients with the exceptions of nitrogen, hydrogen and carbon.