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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:
There are two general rules that we may state about the influence of parent material on soil formation: 1  Finely textured parent materials tend to weather into finely textured soils. Coarsely textured parent materials tend to weather into coarsely textured soils. 2  Darker minerals tend to yield more fertile soils.