Across
- 3. To keep in a certain condition
- 5. The planet we live on.
- 8. Fluid all living things drink in order to survive.
- 9. Able to be maintained at a certain level.
- 11. To cut down on or use less.
- 13. Humans breathe this to survive.
- 14. To keep safe.
- 15. Huge body of water that makes up more than 70% of the Earth.
Down
- 1. A substance or object that can be decomposed by bacteria or other living things.
- 2. Trash left on the grounds of public areas.
- 4. Living things that feed off of organic material.
- 6. To convert or reprocess materials so they can be used again.
- 7. To think about again.
- 10. A large woody plant of considerable height and branches.
- 12. All of the living and nonliving things in an area.