Topsoil: This layer contains the most organic material/humus., This layer contains very small rocks., Sometimes called Horizon A., This is the layer where plants grow and die., Starting from the top, this is layer #1., Subsoil: This layer contains a little organic material/humus., This layer contains medium-sized rocks., Sometimes called Horizon B., Starting from the top, this is layer #2., This layer is a mixture of topsoil and parent material, Parent Material: This layer contains large-sized rocks., Starting from the top, this is layer #3., This layer forms when bedrock starts to be weathered and broken up, Bedrock: This layer is straight up SOLID ROCK., Starting from the top, this is layer #4., All the soil layers originally started as this layer,

Soil Layers!

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