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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:
Primary Soil Particle: Mineral particles sizes including sand (0.05 to 2 mm), silt (0.002 to 0.05 mm), and clay (<0.002 mm.) Soil Porosity: The ratio of the volume that is not occupied by soil particles to the bulk volume of the soil is called soil porosity.