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
One Direction: Where We Are – The Concert Film One Direction: Where We Are – The Concert Film One Direction: Where We Are – The Concert Film, also known as One Direction: Where We Are – Live from San Siro Stadium is the second concert film by English-Irish boy band One Direction and the sequel to "". The film takes place during the 28 and 29 June 2014 shows of the band's Where We Are Tour at San Siro Stadium in Milan, Italy. It contains a 15-minute interview with the band with exclusive behind-the-scenes footage. Initial rumors of a sequel to "This Is Us" surfaced in April 2014 as