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 and planned to release new music videos before their album was available in stores. American Authors Production Notes Citations What We Live For What We Live For is the second studio album by American pop rock band American Authors, produced by returning collaborators Aaron Accetta and Shep Goodman. Running at 42 minutes and comprising twelve tracks, the album was released worldwide by Island Records on July 1, 2016. The album marks the third major release by the band under the American Authors moniker, and largely continues the sound of their debut album, "Oh, What a Life". "What We Live For"