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In science class we are testing the absorption of soil We wanted to know which soil holds the most water The absorbency and porosity have a big effect on the experiment Absorbency-the soils ability to hold water porosity- the amount of open space between the soil particles Since the absorbency is the ability to hold the water it affects how much water the soil can hold Porosity is the space between the soil particles it affects the soil being able to hold the water because if there is a lot of porosity the water will go right through the soil and if there is a little then the soil will absorb more The other part of the experiment is the percolation rate-how quickly water moves through the soil The soils we are testing are sand topsoil and clay these three soils are the independent variable the amount of water absorbed depends on the soils and so this is the dependent variable The variables I control are the amount of soil and water the size of the filter and the type of filter and lastly the filtration system itself The filtration system is what holds the soil as water is being poured over it and holds the excess water This is an overall view of the experimentFor my experiment it is my belief that if we poured water over the topsoil then the least water would show up in the beaker because the topsoil has the least porosity of the three soils helping it absorb more than clay and sand The materials I used to conduct this experiment are sand topsoil clay kitty litter water bottle filtration system and one of the three filters coffee filter cheese cloth and fabric To conduct this experiment follow these stepsSet up three filter systems Make the filtration system by cutting top off of 3 bottles to 9 cm and flip it so the spout is in the bottom
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