The Mesoarchean atmosphere contained high levels of atmospheric methane and carbon dioxide, which could be an explanation for the high temperatures during this era.
Category:John Glenn (Wikimedia Commons) John Herschel Glenn Jr. (July 18, 1921-December 8, 2016), was an American aviator, engineer, astronaut, and United States Senator from Ohio.
Earth in the early Hadean had a very thick carbon dioxide- and methane-rich prebiotic atmosphere, but eventually oceans made of liquid water were formed.
