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O = Litter Horizon A = Topsoil (humus/sand/silt/clay)

Soil – the loose, weathered material on Earth’s surface which plants can grow. Litter – a loose layer of leaves and other plant material on top of the soil Humus -decayed plant and animal remains Soil horizon/profile – a layer of soil that differs from the layers above and below it

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O = Litter Horizon A = Topsoil (humus/sand/silt/clay)

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  1. Soil – the loose, weathered material on Earth’s surface which plants can grow. Litter – a loose layer of leaves and other plant material on top of the soil Humus -decayed plant and animal remains Soil horizon/profile – a layer of soil that differs from the layers above and below it Loam – soil made up of equal parts of clay, sand and silt = the best mixture! Decomposers – organisms that break down animal and plant remains and wastes Leaching – drain away from soil/organic matter removed from soil or rock. O = Litter Horizon A = Topsoil (humus/sand/silt/clay) Horizon B = subsoil (clay/washed-down particles from Horizon A. Horizon C = Bedrock , partly-weathered rock material

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