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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 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 Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
==References==
==References==
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