Imagine the world without bridges. How easy would it be to travel to the mall? How about to visit someone in another city? Life without bridges would not exist, as we know it. The first bridges were built as a result of a need to make life and travel easier.
The first bridges were provided by nature. A tree or trees would often fall across a stream or river. This would provide a natural bridge. Debris and stones carried by streams would settle in shallow spots and provide a type of bridge. In the jungle, vines were used to swing over water.
Modern bridges evolved in part due to the natural bridges. Fallen logs evolved into beam bridges, Stone piles evolved into piers and arches. Suspension bridges were a natural development in warm climates where there were plenty of vines available to make bridges. This unit will attempt to teach math and science concepts using data that demonstrates the important role of bridges in the world and in our lives.