Across
- 5. to change from one form to another
- 8. a fossil fuel that is extracted from underground
- 10. energy from a physical force
- 11. the energy of motion
- 12. energy produced by the sun
- 13. energy in the vibrations that cause sound
- 14. a device that produces electricity by light striking a substance
- 19. materials that cannot be replaced by nature
- 23. material people no long want or they can’t find other uses for
- 24. the gravitational energy in flowing water.
- 26. energy from a light source, such as the sun
- 27. plant material such as wood
- 30. energy released by chemical reactions
- 31. energy heat that is transferred from the Earth’s hot core
Down
- 1. material that reduces the speed of heat loss or cold loss
- 2. rapid movement back and forth
- 3. dilute sulphuric and nitric acid that falls as rain or snow
- 4. coal, oil, and natural gas that developed over millions of years from decayed plants and animals
- 6. energy sources that are replenished by nature
- 7. the ability to do something with the minimum effort or waste
- 9. a ball sitting at the top of the roof is an example of this type of energy.
- 15. the release of harmful substances into the environment.
- 16. a unit for measuring electrical energy
- 17. the measure of how much energy is used over a period of time
- 18. gas used in home heating, that comes from underground deposits
- 20. a form of energy that can be transformed into other forms such as light, heat and sound
- 21. the ability to do work.
- 22. a fossil fuel found beneath the Earth. It is mined.
- 24. energy the energy contained in warm objects due to their warmth.
- 25. the energy stored in a body
- 28. the haze formed from automobile and industrial exhaust
- 29. a piece of wire in an incandescent light bulb