| A | B |
|---|
| Nutrients | materials that plants and animals need to live and grow |
| Subsoil | the layer of soil just undr the topsoil and is not good for growing plants |
| Bedrock | the bottom layer of soil formed over a long period of time; Bedrock is not good for growing plants. |
| Conservation | the protection and safe use of a natural resource (such as soil and water) |
| Clay | tiny particles of soil that hold water well and provide nutrients |
| Sand | small grains of worn-down rock containing few nutrients and unable to hold water well |
| Silt | very small, broken pieces of rock which are larger than clay and smaller than sand |
| Humus | the decayed (once living) matter in soil that adds nutrients and is found mostly in topsoil; it is very good for growing plants |
