Earth Day

4. Use an item again
5. Disease from polluted water
9. Earth's Process
10. The most abundant energy source capable of being harnessed by humans. (2 words)
11. The name given to gasses that trap heat and cause global warming.
13. The part of the earth’s atmosphere that repels the sun’s ultraviolet rays. (2 words)
16. Economic and careful use of natural resources
17. Agent that spreads disease
18. Global warming causes melting of _______

1. A layer of earth's atmosphere
2. When we talk about the 3R's the middle R is _________
3. Earth's Envelope
6. A kind of vehicle
7. Destruction of forest and trees
8. A Combination of smoke and fog that pollutes atmosphere
12. The Earth Day promotes ___ Cities
14. The study of relationship between plants of animals and their surroundings
15. H2O
16. Sharing arrangement with vehicle
19. Chlorofluorocarbons