Across
- 3. a silver, lightweight metal that is not magnetic
- 6. a mixture of decaying materials used to feed plants
- 8. to decompose or rot
- 11. a metal that is used to make steel, it is also magnetic
- 13. a source of energy that formed from the remains of dead plants and animals
- 14. the process by which water goes from the sky to the Earth over and over again
- 17. a material that are always being replaced and will not run out
- 19. to use a material again
- 21. a fossil fuel, a black liquid that is used to make gasoline and plastics
- 22. to stop something from happening
Down
- 1. a material that can't be replaced quickly enough to keep from running out
- 2. a fossil fuel made of a mix of different types of gases
- 4. the amount of a material that is available to be used
- 5. a material found in nature that people use
- 7. to protect and care for natural resources
- 8. to make something impure and unsafe to use
- 9. to throw something away or use carelessly
- 10. water that falls from the sky as a liquid or a solid
- 12. a fossil fuel, a black rock formed from dead plants
- 15. to remove or to take out
- 16. rock that contains metal
- 18. a strong metal that is a mixture of iron, carbon, and other metals
- 20. a reddish brown metal that is a good conductor of electricity