What is a bridge?
Q: What is a bridge?
A: A bridge is a structure designed to cross an open space or gap.
Q: What are bridges mostly made for?
A: Bridges are mostly made for crossing rivers, valleys, or roads.
Q: What are most big bridges made to carry?
A: Most big bridges are made to carry vehicles.
Q: What are highway overpasses?
A: Highway overpasses are bridges that carry a road over another road.
Q: What are military bridges?
A: Military bridges are portable bridges that can be easily moved to where they are needed.
Q: What were the first man-made bridges probably made of?
A: The first man-made bridges were probably made from cut wood or stones.
Q: What are most large bridges made of in recent centuries?
A: In recent centuries, most large bridges are made mostly of steel.
