Atmosphere of Earth surface. The refractive index of air depends on temperature, giving rise to refraction effects when the temperature gradient is large. An example of such effects is the mirage. "Atmospheric circulation" is the large-scale movement of air through the troposphere, and the means (with ocean circulation) by which heat is distributed around Earth. The large-scale structure of the atmospheric circulation varies from year to year, but the basic structure remains fairly constant because it is determined by Earth's rotation rate and the difference in solar radiation between the equator and poles. The first atmosphere consisted of gases in the solar nebula,
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