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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 texture of soil is determined by the ratio of sand, clay, and silt in soil. Soil with higher sand is sandy loam and feels more grainy because sand grains are larger than than the other rocks grains. Silty loam is produced by a higher percentage of silt in the soil. It is a finer grained soil because silt tends to be smaller than sand. On the soil triangle, these three components are able to make up a wide variety of soil textures. Soil is named for its texture, thus the texture of a soil is very important. Too much or too little of any of these components can make the soil not usable for agriculture.