Across
- 3. the central core of an atom
- 4. made from gasoline and alcohol mixing
- 6. energy rich substances formed from dead organisms
- 8. energy from the sun
- 9. intense heat from Earth's interior
- 11. the part of the nuclear reactor where nuclear fission occurs
- 14. a change from one form of energy to another
- 17. compounds made from oil
- 18. is a substance the provides energy
- 19. made of metal cadmium
- 20. layer of material that traps air
Down
- 1. burning of fossil fuels
- 2. rods made of u-235
- 5. the splitting of an atom's nucleus into two mini nuclei
- 7. electricity made by flowing water
- 10. made from living things
- 12. chemicals that contain hydrogen and carbon atoms
- 13. the percentage of energy that is used
- 15. fuel rods generate too much heat that they start to melt
- 16. another name for oil