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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:
The terms used to describe the soil consistency in three moisture states and a last not affected by the amount of moisture are as follows: 1  Consistency of Dry Soil: loose, soft, slightly hard, hard, very hard, extremely hard. 2  Consistency of Moist Soil: loose, very friable, friable, firm, very firm, extremely firm.