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
What We Live For "we tried to take a lot of the stuff that our fans like and love about us from Oh, What a Life and take that to the next level as far as sounds go. [We] brought back some of the old instruments like mandolin and banjo, but also experimented with a lot of different sounds like vocal samples. We brought back a lot of piano [and] bigger harmonies." Lyrically, the album builds on "Oh, What a Life"s biographical themes, which followed the band's origins and journey; "What We Live For" documents the band's experiences during the present and their perspective