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Across 3. The air surrounding Earth. 4. An organic substance such a coal or petroleum. (2 words) 8. A heavy, colorless gas that is the 4th largest component of air. (2 words) 9. The average weather in a certain place over a period of years 10. The long, narrow current of high- speed winds that affect weather patterns around the world. (2 words) 11. The growth of the global economy 12. To settle or populate again

Down 1. Gases in the Earth's atmosphere that trap heat; they include carbon dioxide. (2 words) 2. Warming of the Earth's atmosphere, land, and ocean, due to excess greenhouse gases.(2 words) 5. The large-scale clearing of trees and other plant life. 6. The area where a plant or animal normally grows or lives 7. A community of plants, animals, and other organisms such as bacteria that depend on each other for survival