Across
- 4. Colorless, odorless gas
- 5. Use to much, use carelessly
- 8. To go on foot
- 10. Knowledge of a situation
- 11. Harmful or unpleasant
- 12. Relating to the sun
- 15. Use old items over again
- 17. To continue, keep the same
- 18. Shortage of water
- 20. Who can make the change
Down
- 1. Make different
- 2. Decayed organic material
- 3. Energy that is collected naturally
- 6. Surroundings or conditions
- 7. Form of energy from charged particles
- 9. Form of transportation you pedal
- 11. To carry from one place to another
- 13. Efficient light bulbs
- 14. Capacity for doing work
- 16. Building with vanes that turn in the wind
- 19. Doing your part