| − | The upper layer of earth's atmosphere, which exists higher than 80 kilometers (50 miles) above sea level.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> | + | The upper layer of earth's atmosphere, which exists higher than 50 miles (80 kilometers) above sea level.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> |