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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:
Parent Material This is the material from which the soil has developed and can vary from solid rock to deposits like alluvium and boulder clay. It has been defined as âthe initial state of the soil systemâ. Jenny H (1941) Factors of soil formation.McGraw-Hill Book Co Inc pp281.arent Material This is the material from which the soil has developed and can vary from solid rock to deposits like alluvium and boulder clay. It has been defined as âthe initial state of the soil systemâ. Jenny H (1941) Factors of soil formation. McGraw-Hill Book Co Inc pp281.