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
One Direction: Where We Are – The Concert Film One Direction: Where We Are – The Concert Film One Direction: Where We Are – The Concert Film, also known as One Direction: Where We Are – Live from San Siro Stadium is the second concert film by English-Irish boy band One Direction and the sequel to "". The film takes place during the 28 and 29 June 2014 shows of the band's Where We Are Tour at San Siro Stadium in Milan, Italy. It contains a 15-minute interview with the band with exclusive behind-the-scenes footage. Initial rumors of a sequel to "This Is Us" surfaced in April 2014 as