Natural Wealth

1234567891011121314151617
Across
  1. 3. Black rock fuel
  2. 5. Fertile growing layer
  3. 7. Organic fuel material
  4. 8. Rich upper soil layer
  5. 10. Mineral-rich rock
  6. 12. Essential liquid resource
  7. 13. Conductive red metal
  8. 15. Earth's heat energy
  9. 17. Underground water layer
Down
  1. 1. Nuclear fuel element
  2. 2. Aluminum source ore
  3. 4. Harvested tree wood
  4. 5. Oil/gas bearing rock
  5. 6. Sun renewable power
  6. 9. Decayed plant fuel
  7. 11. Low-grade brown coal
  8. 12. Forest building material
  9. 14. Fossil fuel liquid
  10. 16. Invisible fossil fuel