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Can your scientist predict which objects will sink and float?
Scientists make a hypothesis, or guess, and then see if it is right or not. Make a hypothesis about each object before you try it. This helps your scientist ask questions and solve problems!
Everything, even you, is made up of tiny pieces called molecules. An object with molecules that are close together, like a rock, will sink while an object with molecules that are further apart, like a soccer ball, will float.