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 Where are represented by the patterns of dots on the television screen. What characters, what bodies, finally exist in "What Where" are created by voice, less absent presences than present absences." Beckett referred to the lit playing area in this production as the "field of memory". "The clear indication is that what we are seeing is both a memory and a scenario: instructions come from the megaphone, the Voice of Bam controls what we see, puts the characters through their movements rapidly without words like a film running over its spools at rewind speed, and then starts again, occasionally stopping when