The region of the atmosphere that extends from ground level to roughly 11 kilometers (7 or 8 miles) above sea level.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
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The region of the atmosphere that extends from ground level to roughly 11 kilometers (7 or 8 miles) above the sea level of the [[Earth]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>