Atmosphere of Earth However, polar stratospheric or nacreous clouds are occasionally seen in the lower part of this layer of the atmosphere where the air is coldest. The stratosphere is the highest layer that can be accessed by jet-powered aircraft. The troposphere is the lowest layer of Earth's atmosphere. It extends from Earth's surface to an average height of about , although this altitude varies from about at the geographic poles to at the Equator, with some variation due to weather. The troposphere is bounded above by the tropopause, a boundary marked in most places by a temperature inversion (i.e. a layer of
The World We Live In (Life magazine) and Joiners of America to contribute $75,000 in memory of W. L. Hutcheson". The forest was renamed the Hutcheson Memorial Forest. Paleontologist Bob Bakker mentions Zallinger's dinosaurs as the spark that ignited his passion for prehistory; ironically, Bakker himself would later argue against Zallinger's rendition. George Olshevsky also cites "The World We Live In" as introducing him to science, and adds that he suggested authoring an updated version; however, "Life"'s editors were not interested. "The World We Live In "was also the basis for a science series by the German comic book Mosaik. "The World We Live In" was followed