Environmental puzzle

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Across
  1. 2. wind solar etc.
  2. 8. energy in a transformed state
  3. 9. can be replenished
  4. 10. remains of ancient organisms that with time and pressure will transform into coal, oil or natural gas
  5. 11. used oil energy a 70% on 2016
  6. 12. in US is made 30% of coal
Down
  1. 1. the ability to do work
  2. 3. source that will eventually run out
  3. 4. 80% of world energy
  4. 5. forms that can be used directly as they appear in nature
  5. 6. 20% of total energy sources
  6. 7. a solid combustible mineral made of carbon, formed with organic matter after millions of years of compression