Fast reference is the key to this science dictionary, written and designed especially for junior and senior high school students. It presents 130 two-page spreads, each spread devoted to a scientific theme—or general scientific topic. Themes are arranged alphabetically, starting with acids, bases, and alkalis, and ending with zany and curious science. Other themes cover a wide range of topics, including chemical equations, ecology, human reproduction, periodic table, and many more. Each theme contains approximately 15 scientific terms, clearly defined, and where helpful, supplemented with a diagram or illustration.