Across
- 2. Needed by humans for chemical energy.
- 3. Needed for tidal/wave energy.
- 5. Energy harvested from heat within the Earth.
- 6. Law of ______ of energy.
- 9. Source of energy that will not run out.
- 10. Clean, non-renewable gas.
- 11. Used to create nuclear energy.
- 12. Fuels derived from organic remains of prehistoric animals.
- 14. Energy utilised by 'tower of power'.
Down
- 1. Potential energy in planes.
- 2. More energy efficient than incandescent.
- 4. A gas harvested from biomass.
- 7. Large structures found on a wind farm.
- 8. Can never happen to energy.
- 13. Origin of all the worlds energy.