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Simple Machines
Blastoff! Readers: Screws
Screws are simple machines used for many different jobs. The concept of a screw is used in snow blowers, drills, and presses. Kids can learn how screws work, and how they are used in complex machines.
- GenresNonfiction
24 pages, Hardcover
First published August 1, 2009
2 people want to read
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