Across
- 2. energy from the sun
- 3. fuels formed from dead plants and animals
- 5. heat from within the earth
- 8. energy released from atomic reactions
- 10. energy from living organisms or their waste
- 11. gray brown haze produced by chemicals
- 12. materials on Earth that are available for our use
Down
- 1. electricity generated from the movement of water
- 4. energy being generated from the movement of wind/air
- 6. snow sleet or rain that has a high acid content
- 7. natural resources that are constantly being replaced
- 9. natural resources that are used up faster than they can be replaced