Atmosphere of Earth and balloons, and too low to permit orbital spacecraft. The mesosphere is mainly accessed by sounding rockets and rocket-powered aircraft. The stratosphere is the second-lowest layer of Earth's atmosphere. It lies above the troposphere and is separated from it by the tropopause. This layer extends from the top of the troposphere at roughly above Earth's surface to the stratopause at an altitude of about . The atmospheric pressure at the top of the stratosphere is roughly 1/1000 the pressure at sea level. It contains the ozone layer, which is the part of Earth's atmosphere that contains relatively high concentrations of
What We Live For made available the same day. The album's opening two tracks, "What We Live For" and "I'm Born to Run" were also made available to purchase in April 2016, on the album's page on iTunes. Supporting the album, the band embarked on a 19-date tour of the United States from March through to May 2015, performing songs appearing on the new album live, in the lead-up to its release. It was announced through the band's Facebook page that the album's release date was pushed nearly two months from their original date, saying they are "putting the finishing touches" on their album