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AP Environmental Science Exam

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Last update by christinajhull on 05/01/2011
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AP Environmental Science Exam
AP Environmental Science Exam
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To study for the AP Environmental Science Exam in May.
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Free Flashcard From AP Environmental Science Exam
Question: A Horizon
Answer: The horizon below the O layer, made up of weathered rockand some organic material that has traveled down from the O layer. Often referred to as topsoil and plays an important role in plant growth.