Atmosphere of Earth (see the temperature section, below). Because the general pattern of the temperature/altitude profile is constant and measurable by means of instrumented balloon soundings, the temperature behavior provides a useful metric to distinguish atmospheric layers. In this way, Earth's atmosphere can be divided (called atmospheric stratification) into five main layers. Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere. From highest to lowest, the five main layers are: The exosphere is the outermost layer of Earth's atmosphere (i.e. the upper limit of the atmosphere). It extends from the exobase, which is located at
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