radiation

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Across
  1. 3. radiation - the transfer of heat in the form of wave energy
  2. 5. waves - all electromagnetic waves, including have a measurable wavelength
  3. 6. - the color of the objects that absorb sun energy the best
Down
  1. 1. - metal heaters that radiate heat energy in buildings
  2. 2. - the heat source of the earth and our solar system
  3. 4. waves - very short waves