Hard or soft? -- What is matter? -- Hard and soft materials -- Changes in hardness -- Scavenger hunt.
Summary:
"A nail is hard. A cotton ball is soft. Why are some objects hard and others soft? Find out in this series about materials and their properties. Informative, at-level text and engaging photographs help readers understand the differences between hard and soft materials."-- Provided by publisher.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.