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Denise wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She will use soil, a long pan, and several 4-inch-tall wooden blocks to build a model hillside. She will use a watering can to simulate rainfall. In her experiment, which factor should be Denise's changed variable?
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Denise wants to find out how the steepness of a hill's slope affects the amount of soil that erodes...
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