Atmosphere of Earth surface. The refractive index of air depends on temperature, giving rise to refraction effects when the temperature gradient is large. An example of such effects is the mirage. "Atmospheric circulation" is the large-scale movement of air through the troposphere, and the means (with ocean circulation) by which heat is distributed around Earth. The large-scale structure of the atmospheric circulation varies from year to year, but the basic structure remains fairly constant because it is determined by Earth's rotation rate and the difference in solar radiation between the equator and poles. The first atmosphere consisted of gases in the solar nebula,
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