Arch bridge

An arch bridge is like a big rainbow road that helps people cross over water or other obstacles. The bridge is made out of very strong materials, like steel, concrete or stone. The arch shape helps the bridge stay up by spreading the weight of the road, cars and people evenly across the sides. Think of it like building a really strong tower, but instead of going straight up, it goes from one side of the water to the other. Arch bridges have been around for a long time, even back in the olden days, and they are still used today because they are really good at holding a lot of weight and can last a very long time.