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
Harry Potter and the Deathly Hallows – Part 2 (video game) critics, though some critics found "Part 2" an improvement of "Part 1". Lowest ratings on Metacritic came from GamesRadar, stating, "This is the absolute nadir of the series. Harry Potter has finally devolved into a total cash-in and we can't score it low enough." GamingXP gave the Xbox 360 and PC versions positive reviews, saying "Where graphical aesthetics, thrilling atmosphere and a cinematic soundtrack celebrate their marriage, the gamer always wins." "The Escapist" gave it two-and-a-half stars out of five and said of the game, "The shooting mechanics and levels are getting better but the encounters themselves are too repetitive.