In the soil profile below, iron is present in both the top and bottom later, as labeled, but why is only the second layer a reddish color? 
A) The iron oxide was leached from the top layer in what was most likely a wet environment.
B) The iron oxide was leached from the top layer in what was most likely an arid environment.
C) When exposed to air, the iron oxide loses its reddish tint in what was most likely a wet environment.
D) When exposed to air, the iron oxide loses its reddish tint in what was most likely an arid environment.
Correct Answer:
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