EM Spectrum

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Across
  1. 4. we use this to heat up food
  2. 6. we listen to think in the car
  3. 7. Heat detector
Down
  1. 1. we use one of these to tell if our bones are broken
  2. 2. a color we cant see
  3. 3. means we can see it
  4. 5. 3rd letter of the greek alphabet