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