So Noah put every little living thing in hybernation for a year? There are also well over 1,000,000 species of insects worldwide. Did Noah wander around with a butterfly net, or did all these insects just show up with their boarding passes when the rains started? Almost no insects live in a completly aquatic enviroment. Did he just wave his wand and all these insects drift off to sleep for a year also? Plant life is not mentioned, but there are no plants that would survive even 40 days underwater. If everything on earth was covered, then the depth of the additional H20 would have to exceed 29,000 feet. Where is that water coming from?
I certainly don't claim to know how plausible this is, but I had read an article once concerning the ante-delugian atmospheric hydrogen stating that the molecular hydrogen content was much higher than present day and that the switching of the neutron and proton spin axis create a radio frequency consistant with the biblical account that the "morning stars sang together", and that this molecular hydrogen existed in sufficient quantity to trigger overwhealming flooding if ignited, in addition to the ground springs which "burst forth".
The article claimed this hydrogen would have burned from the top, down, thus the hydrogen supply would have been exhausted before the oxygen content would reach the critical point. It had credited the former hydrogen "shell" of the atmosphere as causing a perfect "greenhouse effect" which aided the longer life pre-flood humans were known for. This "shell" could have been ignited by an astroid (which also could have opened those groundsprings on impact), but surface flames couldn't ignite it because the resident hydrogen altitude was too great. Also, it was suggested that the sun's highest radiation was restricted from reaching the earth's surface and this caused the water vapor not to rise as fast as present day, thus thundershowers and rainstorms were not possible. In scripture, only after the flood do we find God promising that heat and cold will continue on the earth, indicating the climate of pre-flood days may have been more constant or temperate - concurrent with the "greenhouse" conditions.
Whether true or not, I don't know. But it certainly correlates well with scriptural descriptions of that era of earth's history...