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The '''homosphere''' or ''noosphere'' is the portion of the earth's atmosphere, up to an altitude of about 60 miles, in which there is continuous turbulent mixing, and hence the composition of the atmosphere is relatively constant; as opposed to the ''heterosphere'' or ''exosphere,'' the higher regions in which the composition becomes stratified.<ref>Curry, Judith A. and Peter J. Webster (1999), ''Thermodynamics of Atmospheres and Oceans'', Elsevier, ISBN 0121995704, [http://books.google.com/books?vid=ISBN0121995704&id=mdFzlFfWbiYC&pg=PA3&lpg=PA3&ots=ZTt9_MD1c5&dq=homosphere&sig=OPaOImWtIbiUUnwy2FlvOr8SCTE p. 3]</ref>  

The '''homosphere''' or ''noosphere'' is the portion of the earth's atmosphere, up to an altitude of about 50 miles above sea level, in which there is continuous turbulent mixing, and hence the composition of the atmosphere is relatively constant; as opposed to the ''heterosphere'' or ''exosphere,'' the higher regions in which the composition becomes stratified.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref><ref>Curry, Judith A. and Peter J. Webster (1999), ''Thermodynamics of Atmospheres and Oceans'', Elsevier, ISBN 0121995704, [http://books.google.com/books?vid=ISBN0121995704&id=mdFzlFfWbiYC&pg=PA3&lpg=PA3&ots=ZTt9_MD1c5&dq=homosphere&sig=OPaOImWtIbiUUnwy2FlvOr8SCTE p. 3]</ref>  

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