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Chemistry, 03.04.2020 17:45 jimena15

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

In her experiment, which of the following factors should Nancy make sure that she does not change?

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