History of Earth the third atmosphere, rich in oxygen, emerged when bacteria began to produce oxygen about 2.8 Ga. In early models for the formation of the atmosphere and ocean, the second atmosphere was formed by outgassing of volatiles from the Earth's interior. Now it is considered likely that many of the volatiles were delivered during accretion by a process known as "impact degassing" in which incoming bodies vaporize on impact. The ocean and atmosphere would, therefore, have started to form even as the Earth formed. The new atmosphere probably contained water vapor, carbon dioxide, nitrogen, and smaller amounts of other gases. Planetesimals
Gas-s-s-s ahead, write something, just keep the title."" "Gas-s-s-s" was an idea of Corman's, about a world where everybody over thirty had died. Corman later said "my first thought was to do a science fiction film with allegorical overtones." Armitage remembers the concept just being "a sentence, and that's what we went with ... He let you make it your own, and I did." Corman said that although "there was some good work in" Armitage's first draft, "the points I was trying to make in the script either did not come through or came through too obviously different parts, and it