File:Earthatmosphere iss23 annotated nasa.jpg
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Earthatmosphere_iss23_annotated_nasa.jpg (657 × 329 pixels, file size: 24 KB, MIME type: image/jpeg)
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.
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.
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