Across
- 2. Electricity generated from flowing water
- 3. Cleanest fossil fuel used as CNG
- 5. Organic fuel made from waste and dung
- 7. Fuel formed from dead plants and animals over millions of years
- 10. Clean fuel that produces only water vapour
- 13. Black fossil fuel used in power plants
- 14. Wall built across rivers for hydropower
- 15. Cutting down of forests
- 16. Energy obtained from the Sun
- 17. Pollution-free practices
Down
- 1. Radioactive fuel used in nuclear plants
- 4. Petrol mixed with ethanol
- 6. Splitting of atoms to release energy
- 8. Oldest fuel obtained from trees
- 9. Topmost layer of the Earth
- 11. Alcohol used to make gasohol
- 12. – Moving air used to generate electricity
- 13. Using resources carefully
- 18. Continuous movement of water on Earth