| A | B |
|---|
| clay | It turns into mud when it's wet. |
| soil | Plants can grow in it. It's the loose, weathered thing on Earth. |
| humus | Dark organic material in soil. |
| bedrock | The solid layer of rock below the soil. |
| silt | fine sand carried by water |
| litter | The loose layer of dead plant leaves and stems on the soil. |
| decomposer | They break down the dead bodies. |
| loam | Rich soil that has about equal parts of clay, sand, and silt. |
| top soil | Mixture of humus, clay and other things that forms the top layer of soil. |
| sub soil | The layer of soil below the topsoil that has mostly clay and other minerals. |
| soil horizon | A layer of soil that has different color and texture from other layers. |
| sand | the small, fine pieces of rocks. There are small, loose grains. |
