Also as a side note, before the flood the troposphere would have much thicker because it prevented the rainbow from being seen, it also was thicker to keep free radicals from aging people and accounts for the longer lives of the early humans. There are many possibilities that can be explored by people who have open minds. Biologists often wonder why things got so big (like dinos and trees and insects) this thicker atmosphere would have cuased different conditions for life, it would have been warmer....just many things