The rainbow was produced by God, but it was the atmosphere he changed to do it, not that he couldn't have done it anyhow, but it was a result of the postflood atmospheric conditions that it cam about. Thus it is a natural phenomenon which could not have occured under preflood contitions.
Sorry for the delay in responding; christmas holidays and all that.
You're telling me rain and sun never occured at the same time? In all the years before the flood, not once? How can this possibly be?