(February 22, 2016 at 5:05 pm)Simon Moon Wrote:What makes you think it had to be so dense or dramatically different?(February 22, 2016 at 4:19 pm)Drich Wrote: What makes you think what constitutes as atmosphere several thousand years ago is what we know the atmospheric make up to be now?
Or is it your "belief" that the earth's atmosphere has always been at it's current concentrations and density?
Of course it is known, by the use of science, not ancient mythological texts, that the atmosphere has changed quite drastically over the earth's existence.
But it has not changed that much over the last several thousand years. Not enough to account for what you are suggesting, that's for sure.
If so, it would have been so dense before the 30K level of sea rise, that life on earth before the 30K sea level rise, would have been drastically different. As would have been the weather and the amount of sunlight reaching the surface. In other words, the earth would not have resembled anything like it actually did for thousands of years.
What is the concentration of O2 at sea level? what is the concentration of O2 @30K feet? right now today? about 21% (give or take) at both. The air mix is the same both here at at alt. what is lessened is Psi or volume. @ sea level we have 14.7 PSIG at 30K feet we have 3.62 PSIG.
http://www.allstar.fiu.edu/aero/oxygen.htm
All we need is more volume. Not a thicker concentration/more dense air. Yes this would increase the seal level PSIG at the time, but as the earth swelled it would explain why/how the animals 'slept.' (hypoxia) That said volume does not equate to changes in plant life or animal operation. It would be no different than taking a exotic bird from some jungle in brazil at sea level to live in Denver or peru.
