The Science Rocks! series provides a simplified look at Science. Learn about marvelous motion in these easy-to-read books. Force, gravity, and friction connected with motion are explained in simple text and matching art. A science activity, fun facts section, glossary, and index aid students in learning. Special thanks to content consultant Paul Ohmann, Ph.D. Looking Glass Library is an imprint of Magic Wagon, a division of ABDO Publishing Group. Grades preK-4.