1. Humus is organic matter from dead plants.
2. A horizon is a layer of soil. Horizon A is topsoil. Horizon B is clay and rock. Horizon C is the lowest soil level. Below the horizon C is:
3. Bedrock! This layer is rock that has not been weathered.
4. Sand - The largest particles that make up soil.
5. Clay - The smallest particles that make up soil.
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