A transverse wave composed of an oscillating electrical field and a magnetic field that oscillates perpendicular to the electric field.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
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A transverse wave composed of an oscillating electrical field and a magnetic field that oscillates perpendicular to the electric field.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>