A Horizon - Topsoil, B Horizon - Subsoil, C Horizon - Bedrock, Leaching - Occurs when there is a high amount of raindfall, Hardpan - Thin crusty layer that is impermeable to water, Percolates - Soaks or filters through, Soil profile - Vertical section of soil, from its surface downwards, Humification - Process of plant litter changing into humus, Plant litter  - Dead leaves and twigs on top of the A horizon, Impermeable - Does not allow water to flow through it,

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