This book explains words that will help the reader understand more about forces, electricity, sound, light and materials. The words are listed in alphabetical order, with a clue at the top of each page to help find the right place. The trail of underlined words can be followed to find even more information. It provides the definition of words associated with the material world, such as various metals and chemicals and their uses. It is one of a seroes of books on core curriculum subjects that can help readers learn the meanings of each subject's key words in a clear and simple way. This different type of book helps to support alphabetical skills as well as developing literacy skills and provides a reference source for the core subject in each book.