How is a bridge built? Cement is mixed with water and rocks to make concrete. The concrete is poured into holes and into blocks that are stacked to make a bridge. Once fences and lights are added to the bridge, cars can drive across it.
Sprache Spanisch ● Format PDF ● ISBN 9780822572022 ● Verlag Lerner Publishing Group ● Erscheinungsjahr 2006 ● herunterladbar 3 mal ● Währung EUR ● ID 5846036 ● Kopierschutz Adobe DRM
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