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Have you ever wondered how gravity works? Read this book to find out! Also learn how gravity affects your weight, space travel, and even the orbits of the planets!Includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.Readers Advance is a series of full-color nonfiction science readers designed to address the challenges of reading in a content area. Each student book is written around a single science concept. Each full-color reader focuses on a popular science topic currently being taught at each grade level.