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The region of the atmosphere that spans altitudes of 48 kilometers to 80 kilometers (50 miles.)<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
{{stub}}The region of the atmosphere that spans altitudes of 48 kilometers to 80 kilometers (50 miles.)<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
==References==
==References==
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