A soil profile typically reveals four soil horizons. What are they?

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     humus, silt, sand, and gravel
      the O Horizon, the A Horizon, the B Horizon, and the C Horizon
      the A Horizon, the B Horizon, the C Horizon, and the X Horizon
      humus, organic-mineral soil, mineral soil, and volcanic ash
asked Jun 25, 2012 in Environmental Science by anonymous
    

1 Answer

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the O Horizon, the A Horizon, the B Horizon, and the C Horizon
answered Jun 26, 2012 by Geodude ~Top Expert~ (9,680 points)

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