Resources

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Across
  1. 4. liquid mixture of hydrocarbons that are present in certain rock
  2. 6. resources which continue to exists despite being consumed
  3. 7. formed from the remains of living organisms
  4. 8. accumulation of valuable minerals formed by gravity
  5. 10. energy generated in a way that does not deplete natural resources
  6. 11. using less energy to perform the same task
  7. 13. extraction of metal from its ore by using heating and melting
  8. 17. nuclear reaction where the nuclei fuses
  9. 18. natural substances that are not replenished or replaced
  10. 19. energy that uses the power of water to generate electricity
  11. 20. energy from the sun's rays
Down
  1. 1. nuclear reaction where the heavy nucleus splits
  2. 2. mining beneath the surface of the earth
  3. 3. energy formed or produced by living organisms
  4. 5. cultivation of forest for farming
  5. 9. energy that is taken from the earth's core
  6. 12. mining on top of the earth
  7. 14. prevention of the waste of electricity
  8. 15. natural occurrence of rock or sediment which contains ore
  9. 16. a solid inorganic substance of natural occurrence