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In this introductory demonstration and activity, students are introduced to the concept of density as they explore a rock and a wooden block in water. First students address the misconception that heavy things sink and light things float by observing a small rock and a larger heavier wooden block on a balance and then in a tank of water. The lighter rock sinks while the heavier wooden block floats. Students realize that there must be something more to sinking and floating than size or weight. Students investigate further by using the water displacement method to find volumes of water equal to a block of wood and a rock.
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