Energy’s the Word

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Across
  1. 6. Can be replaced
  2. 7. Energy dense
  3. 9. Natural gas extraction
  4. 11. Mother nature's gift to energy
  5. 12. End goal
Down
  1. 1. Can be used up
  2. 2. Best FF for environment
  3. 3. Radioactive
  4. 4. Completely replaced
  5. 5. Fractional distillation
  6. 8. "Liquid Gold"
  7. 10. Worst fuel for environment