Light and heat energy

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Across
  1. 2. Heat transfer between electromagnetic waves.
  2. 5. The price of solar panels, (hint not cheap).
  3. 6. This is a group of solar cells.
  4. 7. The most common unreliable energy source.
  5. 9. When an energy source can continue forever.
  6. 11. Heat transfer between two objects.
  7. 12. Heat transfer between fluids.
Down
  1. 1. The time when solar energy can be collected.
  2. 3. There must a _________ in temperature for heat transfer to take place.
  3. 4. The introduction of contaminants into a natural area.
  4. 8. Source of energy for most energy resources.
  5. 10. The energy released from the sun.
  6. 13. This is where the energy is collected.