RADIATION

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Across
  1. 3. The word radiation comes from
  2. 4. transfer of energy by waves
  3. 5. metal heaters that radiate heat energy
  4. 6. waves that have a measurable wavelength and travel through space
  5. 7. the only type of radiation that you can see
Down
  1. 1. another word for harmful radiation
  2. 2. heat waves