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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:
In most mineral soils, the soil particle density has a short range of 2.6-2.7 g/cm 3 (Hillel 1980b). This density is close to that of quartz, which is usually the predominant constituent of sandy soils.