Can you catch it? Can you build with it? It is a solid. Things that are solid hold a shape and size. Everything on Earth made of one of three kinds of matter: liquids, solids, and gases. In Solids, readers will learn about the properties that help identify solids. This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content. This book comes alive with video, audio, weblinks, slide shows, activities, hands-on experiments, and much more.