Atmosphere of Earth relatively warm air above a colder one), and in others by a zone which is isothermal with height. Although variations do occur, the temperature usually declines with increasing altitude in the troposphere because the troposphere is mostly heated through energy transfer from the surface. Thus, the lowest part of the troposphere (i.e. Earth's surface) is typically the warmest section of the troposphere. This promotes vertical mixing (hence, the origin of its name in the Greek word τρόπος, "tropos", meaning "turn"). The troposphere contains roughly 80% of the mass of Earth's atmosphere. The troposphere is denser than all its overlying atmospheric
The World We Live In (Life magazine) The World We Live In (Life magazine) The World We Live In appeared in the pages of LIFE magazine from December 8, 1952, to December 20, 1954. A science series, it comprised 13 chapters published on an average of every eight weeks. Written by Lincoln Barnett, "The World We Live In" spanned a diverse range of topics concerning planet Earth and universe, and employed the talents of countless artists and photographers. These included, among others, cameramen Alfred Eisenstaedt and Fritz Goro, and artists Rudolph Zallinger and Chesley Bonestell. "The World We Live In" was introduced to Life's readership as "the