Solar Thermal Energy

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Across
  1. 4. the _____ of solar thermal energy has increased
  2. 6. greeks used to allow light in their homes
  3. 7. the first pro of solar thermal energy
  4. 8. light can not be easily saved for later
  5. 10. power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines
  6. 13. metals emit electrons when light shines on them
  7. 15. absorbs the suns rays and transfers them
  8. 18. in 1876 was discovered to produced electricity when exposed to light
  9. 19. objects used by the Greeks to start fires
  10. 20. relating to the sun
Down
  1. 1. came up with the photoelectric theory
  2. 2. the second con
  3. 3. the man to prove Einsteins theory correct
  4. 5. solar thermal energy has low... (3rd pro)
  5. 9. what century does solar thermal energy date back to?
  6. 11. first to use solar thermal energy
  7. 12. discovered the photovoltaic effect
  8. 14. solar thermal energy doesn't cause this (2nd pro)
  9. 16. rooms Greeks used to allow heat in
  10. 17. relating to heat