B3 2020 Lee

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Across
  1. 2. producing crops or soil/animal cultivation
  2. 4. a chemical compound that is colorless and often used as pain relief/N₂O
  3. 5. process where people started to use machines
  4. 8. process where fertile land becomes desert
  5. 9. gas that can stay in the atmosphere/ also known as F gases
  6. 10. rise of the level of the ocean's surface
  7. 13. energy made from renewable resources that nature can replace by itself
  8. 14. a layer that observes the UV rays from the Sun
  9. 17. 4th layer in the atmosphere that is the hottest
  10. 21. a rise in average Earth's atmosphere temperature
  11. 23. water that is in the form of gas
  12. 24. gas that makes up 78% of the atmosphere
  13. 25. a substance that is released/ car _____ causes global warming
  14. 26. a chemical compound in the troposphere that is made of nitrogen and VOCs
Down
  1. 1. energy that cannot be replaced in nature faster than the consumption
  2. 3. harmful chemical or gas that is introduced to humans, animals or nature
  3. 6. the lowest atmospheric layer
  4. 7. a gas that contributes to the greenhouse effect/ too much or too little of this can cause climate change
  5. 11. 3rd layer in the atmosphere; temperature decreases as altitude increases
  6. 12. gas that makes up 0.1% of the atmosphere
  7. 15. this gas is used as fuel and has one carbon atoms and four hydrogen atoms
  8. 16. a change of Earth's climate
  9. 18. gas that makes up 21% of the atmosphere
  10. 19. 2nd atmospheric layer that contains ozone
  11. 20. farthest layer in the atmosphere that has the lowest density
  12. 22. chemical compound that is made out of one carbon and two oxygen molecules
  13. 27. Chlorofluorocarbons/ a major gas compound that makes the ozone thinner