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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:
Weeds can be used as a soil indicator. Simply by observing the most prevalent weeds that are growing in a specific area, they can indicate if the soil is acidic or alkaline, whether the soil is a healthy, balanced soil, or if it s depleted. Weeds can indicate a poorly draining soil, or a soil that is unable to retain moisture.