Why Do Bridges Arch? Level 3 Factbook

Why Do Bridges Arch? Level 3 Factbook

Editura
An publicare
2010
Nr. Pagini
16
ISBN
9780521137171

Descriere

A series of twenty non-fiction science readers which engages children in the world around them. What holds up skyscrapers? Why are sports domes curved? Why are triangles used in many bridges? Y...

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