| − | The lower layer of earth's atmosphere, which exists from ground level to roughly 80 kilometers (50 miles) above sea level.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> | + | The '''homosphere''' is the portion of the [[earth|earth's]] [[atmosphere]], up to an altitude of about 50 [[mile]]s 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, [https://books.google.com/books?vid=ISBN0121995704&id=mdFzlFfWbiYC&pg=PA3&lpg=PA3&ots=ZTt9_MD1c5&dq=homosphere&sig=OPaOImWtIbiUUnwy2FlvOr8SCTE p. 3]</ref> |