1. Since lifespan decreased steadily and quickly after the flood the literalist concludes that physics of the world and atmosphere had to be radically changed with the flood.
2. 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.
3. It had to be a brand new event after the flood. Otherwise God would not have used it as a sign/promise of no more global floods.
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