The atmosphere of the Earth (from the Greek atmos - a steam and sphere) is an air environment around the Earth, rotating with it. Its mass is 5,15*1015 t. The composition near the surface is nitrogen - 78,1%, oxygen - 21%, argon - 0,9%, some percent parts of carbon dioxide, hydrogen, helium neon and other gases. ... At the 20 - 25 km of height there is an ozone layer saving the nature in the Earth alive. ... The atmosphere of the Earth possesses an electric field. ...