Across
- 3. To use items again after they have been used
- 5. A fuel such as coal, oil, or natural gas, formed in the earth from plant and animal remains over millions of years
- 6. To process used products into new products by using the materials again
- 7. Resources that can't be replaced within a lifetime
Down
- 1. Resources taken from the earth and nature, then used by humans
- 2. To use less
- 4. The careful use of resources so that they will last as long as possible
- 6. Resources that can be replaced within a lifetime