File:Earthatmosphere iss23 annotated nasa.jpg: Difference between revisions

http://www.greenpolicy360.net/w/Thin_Blue_Layer

http://en.wikipedia.org/wiki/Troposphere

The average depth of the troposphere is approximately 17 km (11 mi) in the middle latitudes. It is deeper in the tropics, up to 20 km (12 mi), and shallower near the polar regions, approximately 7 km (4.3 mi) in winter... The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 75% of the atmosphere's mass and 99% of its water vapour and aerosols.

McGraw-Hill Concise Encyclopedia of Science & Technology. (1984). Troposphere. "It contains about four-fifths of the mass of the whole atmosphere.

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http://en.wikipedia.org/wiki/Atmosphere_of_Earth

The atmosphere has a mass of about 5.15×1018 kg,[2] three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.