Show Atmosphere Above Earths Earth's Surface The atmosphere is believed to extend extend ex ex- tend much more than miles miles' above the earths earth's surface Its density decreases de do- creases rapidly for the first few miles of or ascent then much more grad grad- From the phenomena of twilight twilight twi twi- light due to refraction retraction of ot light it may be demonstrated that the air extends up to a II height of 45 miles but ut other phenomena such as ns the behavior of meteors and the aurora show that rare air nil exists at a n much greater creater height l |