Mara adds 4 tablespoons of water to the sand, 7 tablespoons to the gravel, and 5 tablespoons to the soil. Calculate the porosity of each of Mara's samples using this formula, and record the results in the chart.
% porosity = (amount of water added to sample + total sample volume) x 100
"Total sample volume" is the amount of soil, sand, or gravel. A half cup is equal to 8 tablespoons.
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Water Added to Sample Porosity