A student wants to know how putting salt on the sidewalk will affect whether snow melts or freezes. She finds 10 separate concrete areas and puts a different amount of salt on each. Then she pours snow on the concrete. How can the student make sure this a controlled experiment measuring the effect of different amounts of salt?

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05-06-2024
Biology

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A student wants to know how putting salt on the sidewalk will affect whether snow melts or freezes. She finds 10 separate concrete areas and puts a different amount of salt on each. Then she pours snow on the concrete. How can the student make sure this a controlled experiment measuring the effect of different amounts of salt?

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