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Sources of Heat or Light

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  • What type of source is this?
    Artificial
  • What type of source is this?
    Natural
  • What type of source is this?
    Natural
  • What type of source is this?
    Artificial
  • What type of source is this?
    Artificial
  • What type of source is this?
    Natural
  • What type of source is this?
    Natural
  • What type of source is this?
    Natural
  • What type of source is this?
    Artificial
  • What type of source is this?
    Natural
  • What type of source is this?
    Natural
  • What type of source is this?
    Artificial
  • What type of source is this?
    Artificial
  • What type of source is this?
    Artificial
  • What type of source is this?
    Artificial
  • What type of source is this?
    Artificial
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