| A | B |
|---|
| Soil | is a mixture of rock particles, minerals, decayed organic material air and water |
| Bedrock | is the solid layer of rock beneath soil |
| Humus | is the decayed organic material in soil |
| Fertility | how well soil supports plant growth |
| Loam | Best for growing plants, made of equal parts clay, sand, and silt. |
| Soil horizon | is a layer of soil that differs in color and texture from the layer above it |
| Topsoil | top layer made of humus, clay and minerals HORIZON A |
| Subsoil | Consist of clay and other particles washed down from A HORIZON B |
| Litter | leaves that plants shed from a loose layer on the ground |
| Decomposer | organisms that break the remains of dead organisms into smaller pieces |
