Energy

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