Question

the footwear bridges and railway stations get worn out by time . why

Answer 1

AS THE MACHINES AND THE IRON RODS WILL GET ERODED

Answer 2

By action of natural disasters and the microbes in the air also is a factor.And weathering of the rocks in railway station.As we walk 24/7 we walk in railway station and foot over bridges,by this action it will become rough.

Was my answer helpful to you?Comment.