MCAT Question of the Day
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    Q:

    		 A patina is a tarnish that covers the surface of a metal and gives it the appearance of aging. Patinas occur naturally and are common for copper. Several colors are possible for a copper patina that depend on a number of environmental factors. Marine environments, industrial environments, and arid environments all will produce a different patina. This information suggests the color is a result of which of the following?
    		 

    A

    		 Differing temperatures resulting in different levels of copper oxidation.

    B

    		 The copper adapting to its environment to produce a patina color that will best help it resist corrosion.

    C

    		 Differing origins of copper mines resulting in the tendency to produce different colors when tarnishing.

    D

    		 Different copper salts and oxides that form as a result of exposure to local airborne chemicals.



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