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 We Live For" and "I'm Born to Run". To promote the album, the band went on a U.S. tour to promote the record ahead of its release. In March 2014, American Authors released their debut studio album, "Oh, What a Life", after many years releasing extended plays under the moniker The Blue Pages. American Authors enjoyed considerable success with the album, gaining significant exposure, especially through adult contemporary radio. Their success is largely due to the commercial boom of their hit single, "Best Day of My Life", which by April 2015 had been certified triple platinum by the Recording Industry