Directions: Write ( R ) if the refers to renewable energy and ( NR ) if it refers to non-renewable energy. Write your answer on the space provided.

1. Fossil fuels

2. Nuclear energy

3. Landfill gas

4. Oil refineries

5. Hydroelectric energy

6. Tidal energy

7. Geothermal energy

8. Gasoline

9. Waterfalls

10. Organic materials

11. Animal wastes

12. Methane

13. Propane

14. Solar energy

15. Wind energy

16. Coal

17. Oil

18. Animal waste

19. Crude oil

20. Biomass energy​