Write the correct master horizon designation (e.g. A, E, etc.) for the following description: 1) Horizon made up mostly of organic material 2) Subsurface horizon with illuvial accumulation of clay minerals 3) Surface mainly mineral horizon 4) Bedrock 5) Highly leached horizon Solution 1.Organic material O 2.Illuvial accumulation Clay mineralsl B 3.mainly mineral horizon A 4.Bed Rock R 5.highly leached A2.