| A | B |
|---|
| topsoil | the uppermost layer of soil |
| subsoil | the soil beneath the topsoil |
| silt | soil that is finer than sand and coarser than clay |
| humus | rich soil made up of decomposing plant and animal remains |
| inorganic material | rocks that have been broken down into tiny particles of sand, silt, or clay |
| organic material | decomposing plants and animals |
| compost pile | a heap of organic material layered and covered with soil |
| soil components | sand, clay and humus |
| soil's plasticity | being able to stick together and can be molded |
| pore spaces | spaces that can be filled with air or water |
