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
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