FUN WITH SCIENCE
'(<a href="http://www.j-archive.com/media/2009-05-12_J_28.jpg" target="_blank">Kelly of the Clue Crew shows some colored-changed objects.</a>)  When exposed to air, a cut <a href="http://www.j-archive.com/media/2009-05-12_J_28a.jpg" target="_blank">apple</a> turns brown & copper turns <a href="http://www.j-archive.com/media/2009-05-12_J_28b.jpg" target="_blank">green</a> because of a chemical process called this'
oxidation