The Earth Key Words

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Across
  1. 2. Extracting metals from low grade ores using bacteria.
  2. 5. Hydrocarbon containing a double bond.
  3. 8. Chemical reaction that releases oxygen into the atmosphere.
  4. 11. Hydrocarbon with the general formula CnH2n+2
  5. 13. Atmospheric gas that makes up 80% of the atmosphere.
  6. 16. Layer of the Earth that we walk on.
  7. 18. A compound made from hydrogen and carbon only.
  8. 20. Liquid sewage
  9. 21. The amount of greenhouse gases a person, company or process is responsible for releaseing.
  10. 22. Metal we recycle as extraction uses much more energy.
Down
  1. 1. The oceans formed when the atmospheric water vapour cooled and _________
  2. 3. Greenhouse gas released from burning fossil fuels.
  3. 4. Extracting metals from low grade ores using plants.
  4. 6. Atmospheric gas that makes up 20% of the atmosphere.
  5. 7. A life cycle _____________ is done to assess the impact of a product in the environment.
  6. 9. Organism from which crude oil is formed.
  7. 10. Method of separating metals more reactive than carbon from their ores.
  8. 12. Greenhouse gas released from cows.
  9. 14. Rock containing metal compounds.
  10. 15. Element used to displace some metals from their ore.
  11. 17. Mixture of hydrocarbons mined from the ground.
  12. 19. The process of converting a longer chain alkane into a shorter more useful alkane.