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
Where We Are Tour: Live from the O2 the music video of "What About Now". According to description released:‘The Where We Are Tour: Live From The 02’ also gives fans a rare, intimate glimpse into the lives of Nicky Byrne, Kian Egan, Mark Feehily and Shane Filan with the bonus ‘Where We Are – The Documentary’. This compelling behind the scenes documentary provides a fly on the wall insight into the lives of the band in the run up and during the tour. The boys also chat exclusively about why this tour meant so much to them. Both the DVD and Blu-ray versions will also include the epic