Review this background information to introduce a few concepts to your class. You may also want to explore other activities related to our school program .
Bridges make it possible to cross from one shore of a river to another.
In earlier times, bridges allowed trade between farmers, and the movement of goods across a natural divide. Early man often placed stepping-stones in the narrow sections of small streams as a way to get to the other side. It is easy to see how a bridge might develop, using stepping-stones as a base for logs or planks. The earliest bridge was probably a toppled tree that had fallen across a nearby stream. No, they can be over other roads, over railways, over deep gulleys.