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
Where We Are Where We Are Where We Are is the ninth studio album by Irish boy band Westlife. It was released on 27 November 2009 in Ireland and on 30 November 2009 in the UK through S Records, RCA Records and Sony Music. "Where We Are" is the group's first album following a break from music in 2008. This album was preceded by the lead single "What About Now" (a cover of the Daughtry song) and it was released on 23 October 2009 as a digital download a day later as a CD single. The group collaborated with numerous notable producers for