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,
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