can somebody please explain how does it work?
Because they're made out of materials to prevent that from happening. ;)
Good question, my guess would be that the majority of the water is underground, which is generally above freezing.
There is no water in the fire hydrant until the top valve is opened.
Jesus pretty much answered that one when He said, Oh, ye of little faith! Another thing you might comsider is that we live in a fallen world, and while God protects our spirits (if we let Him) He still allows physical trials because it is part of the remaking process we all endure. I don't think He has a problem with getting insurance, as long as we exist in a place where He allows the natural to run its course.
As the previous posts state, the water is not in the hydrant except when the valve is opened. The nut on top of the hydrant is attached to a long stem which opens the valve several feet below ground and allows water to flow up to the hydrant and out the fittings. When the valve is closed, the water in the hydrant drains out through a set of 'weep holes' down at the valve. ps - when you see a car in the movies hit a fire hydrant and the water comes gushing up - that is just in the movies, it doesn't happen in the real world unless the valve somehow gets torn off, which is very unlikely.
