C9 The Earth and Pollution

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Across
  1. 7. The cutting down of large areas of trees and forests.
  2. 9. The layer of gases that surrounds the Earth.
  3. 10. Makes up 21% of our atmosphere.
Down
  1. 1. Farming, which includes growing crops and raising animals for food.
  2. 2. Makes up 78% of our atmosphere.
  3. 3. Revolution - a period of big change ~200 years ago when people started using machines in factories.
  4. 4. Chemical process where plants and algae use light energy to convert carbon dioxide and water into glucose and oxygen.
  5. 5. Global _______, the increase in the Earth's average temperature caused by extra greenhouse gases being added to the atmosphere.
  6. 6. Climate _________, long-term changes in the Earth's weather patterns and temperatures.
  7. 8. An example of one of the 1% of other gases in our atmosphere, this one's Noble.