| A | B |
|---|
| resource | a material found in nature that is used by living things |
| renewable resource | resources that can be replaced during a human lifetime |
| reusable resource | resources that can be used again and a again |
| nonrenewable resource | a resource that cannot be replaced in a human lifetime |
| humus | the part of the soil that is made up of parts of dead plants & animals |
| sand | soils that have tiny pieces of rock that you can see with your eyes |
| silt | soils with grains of rock that are too small to see with your eyes |
| clay | soils with very, very tiny grains of rock |
| loam | a mixture of humus, clay, silt, and sand |
| pollution | any harmful material in the environment |
| conservation | saving resources by using them wisely |
| reduce | to use less of a resource |
| reuse | to use a resource over and over again |
| recycle | to break down or change a product and then use the material to make something new |
| soil | a mixture of water, air, humus, and tiny pieces of rock |
| types of pollution | land, air, and water |
