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Lever, Screw, and Inclined Plane: The Power of Simple Machines
How simple machines work and how they help us live our lives.
National Geographic supports K-12 educators with ELA Common Core Resources.
Visit www.natgeoed.org/commoncore for more information.
National Geographic supports K-12 educators with ELA Common Core Resources.
Visit www.natgeoed.org/commoncore for more information.
48 pages, Library Binding
First published September 12, 2006
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