Across
- 3. the waste energy from a ketttle
- 4. energy from movement
- 6. represents the energy transfer through a device
- 7. comes from energy released by radioactive substances deep within the earth
- 12. heat that flows from the underground
- 13. used to stop carbon dioxide emissions
- 14. used in small scale gas field power stations
Down
- 1. spreading out wavers when they pass through a gap or move past an obstacle
- 2. sound waves at frequencies above the range of human ears
- 5. unit of power
- 8. very thin glass fibres we use them to transmit signals carried by light or infared radiation
- 9. the useful enery from a radiatior
- 10. is composed of two types of particles, neutrons and protons
- 11. vibrates strongly when a certain frequancy is played