Greenhouse Effect and Global Warming

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Across
  1. 2. warming an increase in the average temperature of the Earth.
  2. 3. an element with the symbol C.
  3. 6. day to day changes in daily temperatures.
  4. 8. the process of cutting down a large number of trees.
  5. 10. another name for the sun.
  6. 11. fuel from decayed remains of animals and plants.
Down
  1. 1. presence into the environment of a substance that is harmful.
  2. 4. O3.
  3. 5. a glass house that traps heat.
  4. 7. used in refrigerator.
  5. 9. a liquid that can dissolve another substance.