Bridges
Have you ever stepped on a stone to get across a puddle or stream? If you have, you were using a bridge.
Bridges are different sizes and shapes. Some bridges have straight “legs,” or supports, called beams. Other bridges have curved supports, called arches. Still others actually hang from strong steel ropes, or cables, that are strung above the surface of the bridge. The cables are then attached to the land on either end of the bridge.
Most bridges go over water, but some bridges were made to carry water. About 2,000 years ago, the Romans built this kind of bridge. One such bridge, in France, had three levels. Water flowed in the top level, and people and carts traveled on the two lower levels.
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