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topic 4 science
soil
| Question | Answer |
|---|---|
| humus | leftover decomposed plant and animal matter |
| horizon | a layer of soil differing from the layers above and below it |
| topsoil | the top layer of soil, rich in humus and minerals |
| subsoil | a hard layer of clay and minerals that lied beneath topsoil |
| pore soil | the space between soil particles |
| permeability | the rate at which water can pass through a material |
| soil profile | a vetical section of soil from the surface down to bedrock |