What Floats? What Sinks?: A Look at Density (Electronic book text)

A rock sinks in the water. A hot air balloon floats in the air. Many objects float and sink. But what makes them move this way? And how do people use floating and sinking in their lives? Read this book to find out Learn all about matter, energy, and forces in the Exploring Physical Science seriespart of the Lightning Bolt Books collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Books bring nonfiction topics to life