Across
- 5. solar energy, insulator, radiation,
- 7. conduction
- 9. efficiency, fossil fuel, ethanol,
Down
- 1. sound, elastic, energy transformation,
- 2. energy, kinetic energy, battery,
- 3. incandescent, renewable energy,
- 4. absorption, reflection,
- 6. energy, atom, particles, appliance,
- 8. energy, coal, power, gravity,