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72) Principals
Author
Language
English
Description
Presents what the school principal does and discusses what they need to know and what kinds of problems they solve.
Author
Language
English
Description
Almost anything we build requires some sort of digging. Buildings, tunnels, and swimming pools all start with holes in the ground. Readers will find out how different kinds of diggers are used to create these holes. They will also learn about how diggers are used to help scientists learn more about the Earth.
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