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The control in the density layer cake experiment is water.

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A key vocabulary word is water, it is the control.

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Density is how much mass is contained in given unit-volume.

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There were different densities stacked in the soda bottle

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Density is a liquids mass divided by the liquid's volume.

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Liquid layers depend on their density.

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The word Independent Variable is what's changed.

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different density liquids will not mix.

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In an experiment, constants  stay the same.

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The word Dependent Variable means what is measured.