Reading Expeditions (Science: Physical Science): Machines Make It Move
Simple machines make work easier. Discover how simple and compound machines lift things up, roll things along, turn things around, and even help your own body work. Learn how simple machines helped build the pyramids and change our world today.
- Paperback | 29 pages
- 171.45 x 215.9 x 6.35mm | 95g
- 25 Jan 2007
- National Geographic Society