Organic Layer, This layer contains ONLY humus, Sometimes called Horizon O, Topsoil, This layer contains humus and very small rocks, Sometimes called Horizon A, Subsoil, This layer contains a little organic material/humus, This layer contains medium-sized rocks, Sometimes called Horizon B, Parent Material, This layer contains large-sized rocks, This layer forms when bedrock starts to be weathered and broken up, Sometimes called Horizon C, Bedrock, This layer is straight up SOLID ROCK, All the soil layers originally started as this layer.

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