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,
What We Live For on the future. "Go Big or Go Home", which would ultimately appear as the seventh track on the final album, was released in May 2015 as a single, after the band's last single promoting "Oh, What a Life", "Luck", was released a year previously. "Pride" also appeared on a single in December 2015, and was also solicited as a promotional single to United States adult contemporary radio thereafter. "What We Live For" was officially unveiled by the band and Island Records on March 2, 2016, with pre-orders for both a digital download and compact disc version of the album being