What are the seven signs of life?How is a compound different from a mixture?What are the different types of muscle tissue?These are just a few of the topics covered in the colorful, information-packed Science Topics books. Designed to expand the middle school curriculum, these books guide readers through specific areas of science, explaining key concepts and providing essential facts. Each topic is then further explored through direct scientific application that shows scientific principles in action. The clear text is supported with colorful photos, detailed artwork, informative diagrams, and highlighted fact boxes.