Across
- 4. comes from dead animals over millions of years
- 7. a mixture of serval different types of gases found deep in Earth
- 8. to use again
- 9. comes from dead plants over millions of years
- 10. resources made by people
- 12. to make something new
Down
- 1. process of protecting resources
- 2. take millions of years to make and cannot be replaced in our lifetime
- 3. 3 types of nonrenewable resources
- 5. another word for oil
- 6. resources that come from nature
- 11. to use less or cut back