Across
- 5. gas turns into liquid
- 7. particles are held next to eachother in fixed positions
- 8. the circulation of a fluid or gas
- 12. energy changes from one form to another
- 15. waves vibrate at right angles
- 16. all objects emit it
- 18. contains all the colours of the visible spectrum
- 19. nuclear fuels produce
- 20. electric generators in power stations are driven by...
- 22. a liquid turns to a gas
Down
- 1. vibrations that travel through a medium
- 2. it does not use fuel to heat water and they are expensive to buy and install
- 3. the universe started with the...
- 4. materials such as wool and fibreglass are the best...
- 5. getting the best value for money
- 6. a part of an electromagnetic spectrum
- 9. used to step up power station voltages to the grid voltage
- 10. it cannot be created or destroyed
- 11. unuseful energy
- 13. dark matt surfaces _______ more infrared radiation
- 14. waves vibrate parallel
- 17. the change of direction in waves
- 21. renewable source of energy