What kind of simple machine helps a skateboarder do gravity-defying stunts? An inclined plane! What inclined planes can be found around the house, and how do they help lift and move things? Explore this terrific nonfiction reader to find out more about inclined planes, and learn 20 new science vocabulary words along the way. Full of information and photographs;this series includes special features like highlighted vocabulary and self-quizzes that reinforce reading skills with science.