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Lever, Screw, and Inclined Plane: The Power of Simple Machines

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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. 

48 pages, Hardcover

First published September 12, 2006

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Gare Thompson

102 books12 followers

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