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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