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An unread, unused copy: no writing or highlighting, and no missing or damaged pages. Every book we sell is brand new, including our lowest-priced titles.
It may sound confusing, but materials are the things we use to make the things we use! Materials can be solid, liquid, or gases. Since the first humans discovered that rocks could be used to hunt or to build shelter, people have used materials to make their lives easier. Learn all about different types of materials and how they can be combined to build an entire city.