From a wristwatch to the school bus, we use different kinds of machines every day. But some machines are made just for fun and can be seen in action at any amusement park. Whether it’s an old-fashioned wooden roller coaster or a cutting-edge new thrill ride, every ride at the park works as a machine. HI-LO/reading level grade 3, 32 pages each, full-color photographs, paperback. Save $1 per book when ordering 10 or more copies.