| − | The region of the atmosphere that spans altitudes of 11 kilometers to 30 miles. (48 kilometers)<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> | + | The region of the atmosphere that spans altitudes of 4 to 30 miles.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> |