Jennifer Boothroyd

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  [PDF] What Floats? What Sinks?: A Look at Density (Lightning Bolt Books — Exploring Physical Science) Jennifer Boothroyd

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  [PDF] What Holds Us to Earth?: A Look at Gravity (Lightning Bolt Books — Exploring Physical Science) Jennifer Boothroyd

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  [PDF] Why Do Moving Objects Slow Down?: A Look at Friction (Lightning Bolt Books — Exploring Physical Science) Jennifer Boothroyd

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