Non-Renewable Resources

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Across
  1. 4. Main component of natural gas.
  2. 7. Element found in coal along with carbon.
  3. 9. Unrefined oil from the ground.
  4. 10. Action taken through mud and sand to reach oil
  5. 11. Combustible black sedimentary rock.
  6. 14. Heavy element used in nuclear fission.
  7. 15. Trace gas found in natural gas.
Down
  1. 1. Second largest component in natural gas (4-5%).
  2. 2. What dead plant matter turns into before coal.
  3. 3. Main element fossil fuels are made of.
  4. 5. Formed from remains that sedimented on ocean floors.
  5. 6. Fuel used in internal combustion engines.
  6. 8. Fuel used in jet engines.
  7. 12. Contaminant in coal that causes pollution.
  8. 13. Another trace gas in natural gas.