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Students perform an investigation to compare the relative specific heats of sand, water, and soil. They fill plastic cups with the same mass of each material, place a temperature probe in each sample, and put the samples the same distance beneath identical flood lamps. Students record temperature data for 2 minutes while the lamps are on, and continue recording data for 1 minute after the lamps are turned off. Which of the following is the dependent variable in this experiment?A. the mass of the materialsB. the change in temperature of the materialsC. the amount of time the lamps are turned on and offD. the different materials
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