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 Did Last Summer What We Did Last Summer What We Did Last Summer – Robbie Williams: Live at Knebworth is a live DVD by Robbie Williams, recorded between 1–3 August 2003 at Knebworth, England as part of the Weekends of Mass Distraction Tour, the second last venue on the first leg of the tour. The album is a DVD companion to the live album "Live at Knebworth" (also known as "Live Summer 2003"). The songs "Nan's Song", "Better Man" and "Made Up Song" all feature Robbie Williams on acoustic guitar. The show's opening with Williams making an entrance hanging upside down on a